Some animal (squirrels?) is eating plastic in our yard: plastic tray on the gas grill, plastic edging in the garden, plastic handles of tools, vinyl siding on the house. If this is a squirrel as we suspect, what can we do to stop it?

You need to find out what animal is doing this. Different animals are managed in different ways, so proper identification is key. If it is squirrel damage, you should be able to see the incisor imprints at the location of …