I work in a laboratory. We seal open containers and tubes with a product called parafilm. It's amazing and will seal anything! Sadly they don't sell parafilm in wide sheets for home use (not that I've seen), but this is somewhat similar. It's a little stretchy, and a little sticky. You can use it to seal things that regular cling wrap won't stick to. And you will get a tighter seal than just covering with foil.
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