Dont use acetone to wash mescaline acetate, where did yu read that? Acetone is used to wash mescaline hcl only.. You need MEK to wash acetates..
Or, another option which should work well is dissolve your acetate in some hot water, filter it to remove non active insoluble material (run some warm water through filter afterwards to pick up the last bits of alkaloids that are trapped in moisture of filter), add base to the filtered solution (like a strong lye solution for example), then pull again and salt again.. Basically re-doing an a/b. That should really clean it up.
Are you using vinegar or acetic acid? Vinegar is quite impure, usually, acetic acid is much better to work with.. Or salt with HCl next time
EDIT: Weird, this thread was about mescaline before, it was a double post of another thread that I deleted... sorry