How do you know if a cleanser is expired? Earlier today, I bought an Oil of Olay regenerist mousse cleanser for $4. It's regularly $15. I don't know if it 's expired or they're just discontinuing that type of cleanser...i'm thinking the lot is probably close to expiration but I don't know how to tell if it's expired or not. I bought it at pharmacy, usually they have cleanser/toners whatever on sale, i don't think the product is discontinued so I don't know why they put it on that much of a sale unless it's close to expiration. I mean, I'll still end up using it, if it messes up my face, well i'll know not to buy that stuff on sale, but the other stuff i've bought on sale is fine.