What are the BEST facial exfoliators?

First check if you can use an exfoliator with proactiv. If you can, try a gentle exfoliator like Neutragena. Don't try one that has any alpha hydroxy in it, that might be too harsh and might counteract your proactiv and you might end up red-faced for a day or more. Aveda also makes a good exfoliator but its more expensive, the over the counter Neutragena is just as good.