i always use the armour all tire gel that goes on the bad and your "rub" it on the tire. sprays and foams are easy but they spray in between the spokes onto your brakes and idk what effect, if any, the chemicals have on it but i also dont want to find out. so its what i like
and imo, the result is the cleanest out there... i should be their spokesman haha jk but thats what i use