I dropped my retainer on the floor. How should I clean it?
Considering the fact people throw up, sneeze, walk, throw trash on the ground, etc..... Naaaaah I think you're fine... Jk. Yes you should clean it.
Well yes I think so :)
With toothbrush & listerine
I don't have a retainer but i do know hot water kills bacteria so try running it under some hot water. Make sure it's not just warm though because that won't help
Clean it good with soap and hot water, sterilized with alcohol or peroxide the wash good again.