Normally, with hard-top cars, the easiest way to clean the underside of the car is to run it through an automatic car wash. On convertibles, where doing this can cause damage to the top seals and subsequently leaks, how can you clean the underside, and are there any options to help it stay clean and rust-free? My first thought for cleaning is a power washer, but what are other options for when one isn't accessible?

  • Run it through puddles really fast? Commented Nov 1, 2017 at 18:13
  • @Pᴀᴜʟsᴛᴇʀ2 Up here, those puddles are liable to be more salt than water :p
    – Ceshion
    Commented Nov 1, 2017 at 18:14
  • If you have a set of quickjacks or just plain and simple jackstands you can just spray the underbody with a regular hose. Only if your underbody is not 100% rough mud.
    – Granny
    Commented Mar 2, 2018 at 8:09

1 Answer 1


Find a pressure wand that attaches to a garden hose (would be nice if it has a soap attachment). Even if the water pressure isn't as high as a pressure washer, it will be better than nothing.

You can put the car on jack stands to give you more room to work, if needed. Spray soapy water on the underside and let it sit for a couple minutes, then rinse.

I have also seen small dollies with spray nozzles attached that can be rolled back and forth under the car. Not sure where to get one, but seems easy enough to make.

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