Most protein shakers are made with durable plastic that can withstand the dishwasher, so long as you put it on the top rack. However, this won’t always be your best bet to clean it. Even if you have a fairly high-end new dishwasher, morsels of protein powder that caked to the inside of your manual protein shaker may still remain. It’s important to give it a thorough rinse, and run your hand along the inside of the container before putting it in the dishwasher, (or just washing it by hand to be doubly certain).\r