I agree wîth Trish and Mary. I wash everything that comes in the house. As I'm a scrapper and recycler, that is a MUST.
I don't use the precuts very often, so I don't have that problem.

But I had a problem recently with the dryer. Made some tablemates , washed them, they were ok, but coming out of the dryer, they were a mess. Especially the binding. So the next time I use my good old clothesline again. Lucky they were only sets.

That is learning by doing!