What Peter said.
There are a very few brands of cassettes that do indeed shed, and can benefit from a limited amount of baking time. I’m dealing with several boxes of them right now. But before doing that, I would check to see if rehousing them in new shells would help first. These tapes did not squeal. They just flat out didn’t move. Some needed a better tape path. Some needed baking. But itis generally less common than for RTR tapes.