If you're asking me, then yes, I actually cleaned them inside and out with denatured alcohol and then washed them with soap and water. And if anyone didn't wash something that'd had mold release, usually the mold release is only on one side. And most vacuforming is done "naked" anyway.

There was a post awhile back in an earlier thread about how canopies fail to take dye nowadays. It was by somebody from one of the ARF importers. He said that the plastic that was being used nowadays was a type that wouldn't take dye and that none of the recent releases by his company had the old plastic in the canopies. So none of their present ARF canopies would take dye. Unfortunately, he didn't mention any way to identify what plastic you've got.