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How to bathe a tortoise
Fill a shallow container with water.
The container should be small enough on the sides that your tortoise should be able to climb out of it. Add lukewarm water to it.
Make sure the tortoise's head pokes above the water when he's in it, but it should be about chin deep. You can also place one end of the tub on a book to create a slight angle, making a shallow end and a deep end.