I have an almost new set of 52mm F4 Classics that have maybe 20 hours of skating on them. Yesterday my board skirted out from me, rolled into some nearby grass, and my wheels grazed some dogshit. I went home and used about eight Clorox wipes disinfecting the wheels, trucks and deck. I think I did a thorough job cleaning what was really only a bit of doodie, but I can't shake the fact that my wheels touched fecal matter. I shouldn't really care because at any given time one's board is a germ infested nightmare, and my board is probably way cleaner now that I scrubbed it down than it was before the incident. Anyway, F4's are the best wheels, and this is just me publicly working through my issues. Peace.