I don't uysally use the PC to remove wax but I don't think that there is a real speed for such task. I would recomend you to experiment start from the lowest speed and work youself up. Untill yopu find something that is comfortoble for you. But just my 2$ if I were you I would remove or buff by hand, depending on the type of wax it should not be that much work. You can also pay more attention to parts were there was wax left over or missed.