Degreasers used in automotive service are the obvious choice, with the caution that they are normally used on metal parts, not polyester resin. I see that CRC (a common line of automotive chemicals in Canada) includes one - QC-82
- which the maker describes as
Foaming water-based formula aggressive enough to break down and dissolve grease, grime, oil, rubber marks and other oil-based contaminants while remaining gentle enough for painted and plastic surfaces.
That sounds appropriate to me.
Brake cleaner is one specialized degreaser/cleaner, but it's really a bunch
of different products: a common brand (Brakleen
) includes multiple formulations. Some of them are extremely flammable (05088, 75088
; largely methanol), some include acetone, and some (5089
) are tetrachloroethylene
(a.k.a perchloroethylene, "perc", or dry cleaning fluid). Tetrachloroethylene is a great degreaser and is not flammable so it seems like a good choice, but it is also toxic and carcinogenic, so I try to minimize the amount that I use. I doubt there is any non-toxic and non-flammable brake cleaner.
As consumers we're not expected to understand much about the products we use because governments and regulations are supposed to ensue that they are reasonably safe, but if we start using them for purposes other than intended, I think we are then responsible for ensuring that we're choosing an appropriate product.