grease remover. Also do not use any other chemical with a spray... i don't know maybe something like Windex, Products to wax vehicles, ect ect... Those chemicals stay around for a little while and could cause fish eyes on your paint ( yes happend to me before when I was in bodyshop class back in highschool) Thats why when its professionally done they use paint booths. Either way... hope that helps... but most of all I would say **buy some real wax and grease remover***
