We bought a new garden furniture set online that has now been delivered - of the wicker/rattan corner type. It's come with loads of thick cushions, for back rest and sitting on. Would it be safe to leave those cushions on the sofa year round, which will in turn be covering with a waterproof tarpaulin, secured with bungee cords when not in use/overnight? I'm worried about condensation and also creatures nesting in the cushions but we've not got anywhere to store these cushions. There's honestly loads of them, they currently fill our whole kitchen sofa and come to about my neck height on there!