Pesach: Old Plastic Cookie Trays
I have some old plastic cookie trays from the packaging of cookies that I have saved and used as storage for art supplies. At one time, chametz had direct contact with them. Now they have been cleaned out and have no visible crumbs. When I started using them for this purpose, it didn’t occur to me that it could be a Pesach problem. Am I required to sell them as chametz or put them away for Pesach?