Everything was purchased at a craft store. I wiped them down with the remaining cleaner, but the cleaner ran out, and some dirt and resin still remain. There is some dirt, but I think it can be used without any problems. I'm decluttering because I'm trying to narrow down my shallow and broad hobbies, and I've disposed of all my resin-related items, but these molds are still usable, so I'm offering them to someone who needs them.