I clean the sink with lemons fqnrueetly (well, when lemons are in season, and everyone is giving them away because their trees are dropping them all over the yard) and it is great! I always cut the lemons pretty small before disposal-ing them, but we've got enormous lemons here in AZ (seriously, 5-6 times the size of "store" lemons. Some are the size of grapefruits). If you've got lemon rinds left over from any cooking, I always put them down the disposal and it cleans everything out (and gets rid of the icky disposal small) very nicely!