When cleaning a hot tub that is empty, there are several household products that can be used. Here are some options:
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White vinegar: Mix a solution of equal parts white vinegar and water in a bucket or spray bottle. Spray the hot tub shell or cover thoroughly and let the solution sit for fifteen minutes. Rinse the surfaces well with warm water.
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Bleach: Mix equal parts of water and bleach in a bucket or spray bottle. Wearing gloves, apply the solution to the surfaces of the hot tub and let it sit for fifteen minutes. Rinse the surfaces well with warm water.
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Simple Green All-Purpose Cleaner: Apply the cleaner to the surfaces of the hot tub and use a microfiber cleaning cloth or sponge to wipe away residue. Rinse the surfaces well with warm water.
Its important to avoid using harsh cleaning products that can result in foamy water when you refill your hot tub. Additionally, its recommended to wipe down the shell, jets, and scum line with a sponge and white vinegar to remove debris that might throw off your water chemistry. Finally, its a good idea to clean your hot tub filters and pipes periodically.