https://encrypted-tbn0.gstatic.com/i...QfPCQ&usqp=CAU

I keep one of these back from my college days, together with various inserts from "kiss a soap bubble" to "peel chrome from a trailer-hitch". They do an amazing job of cleaning everything from contacts to dirty plastic. The marl is non-conductive although the material removed may be.

Peter Wieck
Melrose Park,PA