Very few brake clean sprays will harm plastic.

If they contain Acetone, MEK, or methylene chloride, they will eat/melt/destroy plastic of any kind, even Delrin.


Simple green and Mean Green will do the same thing, but Mean Green is about $3/gal at the Dollar store and a gallon will last all summer if you mix it 4:1 with water.

I use Mean Green, as described above (remove radio tray and engine), with ZERO issues and I like my stuff SPOTLESS.

EDIT<<<<>>>>

I use brake clean spray from O'Reilly Auto Parts.
I buy it by the case and use it to clean engine/clutch parts.

Here is another tip for you guys.
I'm a cheap skate, so I do it this way.

When rebuilding diffs, clean the parts in Naptha.
It dissolves the silicone oils and dries very quickly.
Leaves your parts sparkling clean in just a few minutes and it's cheap.

When washing air filters, use mineral spirits.
It dissolves the filter oil and doesn't break down the foam.
Let it dry for a few minutes and re-oil.
No water necessary.


Both of these chemicals can be bought at Lowes/Home Depot for about $8/gallon.


Scott