Not sanitary. [SEP] Reusable seems like a good idea but keeping a clean one on hand for daily use is not convenient. I washed the volcanic ball with dish soap (grease cutting) & warm water but some oil residue remains, as proven by the discoloration. Even soaking in boiling water didn't rid of the oily smell.<br /><br />If you have oily skin, the ball will quickly become saturated & rendered useless. The one from Revlon probably has the same issues. Stick to blotting sheets.