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How to clean a hamper
Remove all the contents from the hamper.
If it is a picnic hamper, take this opportunity to re-wash everything inside it for the sake of sprucing it up.
Take the hamper outdoors.
Give it a good shake (tip upside down) if this can be done without harming it in any way (be careful of lid joints). Remove any fluff by hand or with a small nozzle attached to a vacuum cleaner.