I have seen a couple times now that hot sauce can be used to clean clad. After trying many other processes including a homemade electrolsis setup I have to say hot sauce is my favorite way to clean coins now here is a before and after. I let theses quarters soak about an hour. I have one from 64 in their that needs a little more soak these were primarily newer. After an hour just take them out dry them of and wash them with dish soap and a hard sponge. Enjoy