Do you want to keep your shower or bathtub clean and bright? Heat a little white vinegar (it does not need to boil), and then place it in a spray and spray it in the shower or tub abundantly. Wait 10 to 15 minutes, then moisten a Sponge Double Use Clean Sun with vinegar by the abrasive part (DO NOT use the metal sponges) and scrub the surface from top to bottom to later rinse and dry with a Microfiber Cloth Clean Sun.