What removes oil and black undercoating but not paint? Options

[MikeK]

I've found slow reducer to be effective at removing things like that.

[rick 918-S]

http://www.914world.com/bbs2/index.php?sho...6585&st=160

Post 165 I used paint stripper in a spray can o purchased from Menards. It did take off some of the paint bit the trunk had been repainted before. I used it.one my 6 too. Sprayed it on let it sit about 10 minutes and used a pressure washer to clean it off
Did less damage to the original paint under the 6

[mskala]

My late update on this:
I bought naphtha, put it into a sprayer bottle, and can confirm it's harmless to
the original lacquer and the yellow-ish undercoating, but takes care of the black
undercoating.

For this year I was only dealing with 20% of the floor area, so it was not too many
hours of work.

Also I was not needing to completely strip undercoating, I was only interested in
cleaning up enough so all the previously leaked oil was gone, so I could put new
Wurth undercoating.

Apparently the 914-6 and 911 have the stippled finish of the yellow frame coating,
so with that you can't just wipe off the black stuff, it's much more tedious dabbing.

You can use a nylon brush, but this requires using significantly more naphtha or
you end up with a brush which just spreads goo everywhere.