Ryoma is highly embarrassed and worried about all the praise he gets for using his magic in ways that are common sense to him, but not to their world.
Scavanger Slimes and Cleaner Slimes are unique discoveries to Ryoma. There is no record of such Slimes.
Normally you would expect the Savanger Slime diet would get the women reacting badly; but it's the Cleaner Slime one about bath water that sets them off.