Vanilla Cafe Sugar Scrub

This is a scrub a made about a month ago and never posted about. I absolutely love this scrub...scent, texture, everything...except what it does to my tub. I don't think I have ever seen a tub get so gross from one scrub session. I think it is the mixture of oils sticking to the tub and then the fact that the coffee grounds are really dark and stick to the oil. Anyone have a suggestion...something to add to the scrub to prevent the oils from sticking to the tub? Maybe something like dryflo or natursorb?