Here are a few mild exfoliants that are gentle enough for you to use on your own face once or twice a week:
Eminence Yam and Pumpkin Enzyme Peel--a great natural enzyme exfoliator. Eminence is a great spa quality line for those who want all natural, vegan products. $42 for 2 oz. on Amazon or at Spa in the Valley in Hunt Valley Center.
Gentle Daily Peel with 2% BHA--a light peel product that uses salicylic acid to keep the top layer fresh. Also good for those with mild breakouts, as it will purge the pores of "gunk". $13 from skin-beautiful.com
AmorePacific Enzyme Treatment Peel--is a powder that become sudsy when water is added. Shake a small amount into your hand and add a little water. Use like a cleanser rubbing in circular motions for 1 minute and rinse. This is expensive $65, but the 2.5 lasts forever. And because it is in powder form and not activated until water is added, it is great for travel ( has a great "no mess" container) and it retains it's potency.