I have some wheel polishing stuff that comes with the cotton batting pre-treated with the compound and that seems to be the best, it comes in a little tin and you just pull out how much you want to use and
throw it away or re-use it when you are done- just make sure you don't get any in the 510, I don't know how it tastes- and I don't want to know... Can't remember which brand it is, but it's cheap and effective