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I used to have 6' tall silk fig trees. Each spring I'd place the wicker "pot" in a plastic garbage bag, tape it around the trunk, then carry it outside on a sunny day. I'd rinse it with a sprayer attached to a garden hose, then let it air dry. After removing the bag, I'd wipe the pot with a damp cloth. It didn't do it any harm and really fixed the tired look those silk plants get as they get dusty.