White spirit cleans gumwalls and whitewalls up fine, both on my girlfriend's Raleigh roadster tyres and the cheap-ish Schwalbe 700cs that I used to have on my beater. I haven't noticed any damage to the rubber - but I don't know if they're natural rubber or synthetic, or if that would make a difference.
I'd say as long as you clean it off with plenty of water it should be fine. Perhaps soak an old tyre in the stuff to see what it does.
White spirit cleans gumwalls and whitewalls up fine, both on my girlfriend's Raleigh roadster tyres and the cheap-ish Schwalbe 700cs that I used to have on my beater. I haven't noticed any damage to the rubber - but I don't know if they're natural rubber or synthetic, or if that would make a difference.
I'd say as long as you clean it off with plenty of water it should be fine. Perhaps soak an old tyre in the stuff to see what it does.