Porsche Club GB

Underside cleaning and treatment

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8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHUnderside cleaning and treatment

Leading reported evidence

Replace coffin arms

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Performed · outcome unconfirmed · Original poster
The coffin arms were replaced as they were creaking somewhat.
Original post Read captured discussion
Underside cleaning and treatment

Frequently discussed work

Clean not essential - also you'll find

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Tend to agree with that - doesn't do any harm to wash the salt off the subframe and suspension after winter, which you can do by jacking the car and using a pressure washer and traffic film detergent, but steam cleaning not essential - also you'll find that as the steam tends to blast away good grease and lubricant as well as muck you may well end up with a load of rattles and squeeks you didn't have before - and then they'll probably want to sell you a lube job as well!
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Underside cleaning and treatment

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Leading evidence: 'Replace coffin arms' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean not essential - also you'll find' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Clean not essential - also you'll find

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Tend to agree with that - doesn't do any harm to wash the salt off the subframe and suspension after winter, which you can do by jacking the car and using a pressure washer and traffic film detergent, but steam cleaning not essential - also you'll find that as the steam tends to blast away good grease and lubricant as well as muck you may well end up with a load of rattles and squeeks you didn't have before - and then they'll probably want to sell you a lube job as well!
Original post Read captured discussion
Underside cleaning and treatment

Clean will do nothing

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
An underbody clean will do nothing for any of that.
Original post Read captured discussion
Underside cleaning and treatment

Use pressure washer and traffic film detergent

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Tend to agree with that - doesn't do any harm to wash the salt off the subframe and suspension after winter, which you can do by jacking the car and using a pressure washer and traffic film detergent, but steam cleaning not essential - also you'll find that as the steam tends to blast away good grease and lubricant as well as muck you may well end up with a load of rattles and squeeks you didn't have before - and then they'll probably want to sell you a lube job as well!
Original post Read captured discussion
Underside cleaning and treatment

Frequently discussed actions (4)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Clean not essential - also you'll find

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Tend to agree with that - doesn't do any harm to wash the salt off the subframe and suspension after winter, which you can do by jacking the car and using a pressure washer and traffic film detergent, but steam cleaning not essential - also you'll find that as the steam tends to blast away good grease and lubricant as well as muck you may well end up with a load of rattles and squeeks you didn't have before - and then they'll probably want to sell you a lube job as well!
Original post Read captured discussion
Underside cleaning and treatment

Clean will do nothing

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
An underbody clean will do nothing for any of that.
Original post Read captured discussion
Underside cleaning and treatment

Replace coffin arms

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
The coffin arms were replaced as they were creaking somewhat.
Original post Read captured discussion
Underside cleaning and treatment

Use pressure washer and traffic film detergent

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Tend to agree with that - doesn't do any harm to wash the salt off the subframe and suspension after winter, which you can do by jacking the car and using a pressure washer and traffic film detergent, but steam cleaning not essential - also you'll find that as the steam tends to blast away good grease and lubricant as well as muck you may well end up with a load of rattles and squeeks you didn't have before - and then they'll probably want to sell you a lube job as well!
Original post Read captured discussion
Underside cleaning and treatment

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Porsche Club GB: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T150039Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I am told the underside of my c4s has quite a lot of corrosion and would be a good idea to steam clean and treat it. Has anyone had experience of this cleaning in and around London? Thanks

POST 2Original post

Daft Q, but have you actually looked underneath? Most of the underbody is covered with plastic liners - not sure what you are being told is corroded?

POST 3 / ORIGINAL POSTEROriginal post

Good point and yes I did briefly sometime ago. The exhaust is corroded, front shocks and I am told the rear drop links! The coffin arms were replaced as they were creaking somewhat.

POST 4Original post

An underbody clean will do nothing for any of that. Which firm are telling you need to have this done?

POST 5 / ORIGINAL POSTEROriginal post

[Image-only or quote-only post; no author-written text.]

POST 6Original post

Please don't!. Steam will not do anything for corrosion anyway[&:] your probably find the Garage looking at your car are Twats. The exhaust system on the 996 was built out of Pig Iron to save the company profits. Unfortunately In the UK's damp climate will Corrode!. Yours probably looks no different to any other, but a customer with a Porsche must have money to spend "Tell them to shove it".

POST 7Original post

Tend to agree with that - doesn't do any harm to wash the salt off the subframe and suspension after winter, which you can do by jacking the car and using a pressure washer and traffic film detergent, but steam cleaning not essential - also you'll find that as the steam tends to blast away good grease and lubricant as well as muck you may well end up with a load of rattles and squeeks you didn't have before - and then they'll probably want to sell you a lube job as well!

POST 8 / ORIGINAL POSTEROriginal post

Thanks all, appreciate your comments. Agreed it wont resolve existing corrosion but surely a steam and subsequent wax will prevent anything further?

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