There are a few different cleaning solutions that you can use to clean pool tile. For all methods, always test your cleaning product on an inconspicuous area before cleaning the entire surface to ensure it does not cause any discoloration or other damage.
Commercial Pool Tile Cleaner
The safest and most effective option is to use a commercial pool tile cleaner, as it is specifically formulated to clean pool tiles without damaging them. Follow the manufacturer's instructions on the label of the cleaner very carefully or you may risk damaging your tiles. Be sure to choose a cleaner that is safe for your type of pool tile.
Vinegar Solution
For regular cleaning, a mixture of equal parts white vinegar and water can be effective at removing mild mineral deposits and scum. This mixture will help break up light dirt and grime. Pour the mixture into a spray bottle and spray the solution on the waterline tile and scrub with a brush. Rinse the area thoroughly with clean water.
Baking Soda Paste
For tougher stains, a paste made of baking soda and water can be quite effective. Baking soda is a mild abrasive that can help to remove dirt and grime without scratching the tile. Simply mix a few cups of baking soda with water to create a paste. (There is no need for precise measuring—you will know it's ready when it can easily be spread across a surface and stay in place.) Apply the paste to the tiles, scrub them gently with a brush, and then rinse thoroughly with clean water.
Pumice Stone
If you have particularly stubborn mineral buildup, a pumice stone will make the cleaning job much easier. Wet the pumice stone and the tile. Scrub the stained area gently with the pumice stone. Rinse the area thoroughly with clean water. Be sure to keep the pumice stone wet whenever you are scrubbing, as a dry pumice stone can scratch tiles.
Melamine Sponge
Melamine sponges, sometimes known as “magic erasers,” can be a useful tool for cleaning waterline pool tiles. They are generally safe for most pool tile materials like ceramic, porcelain and glass tiles. This method is best for spot-cleaning especially dirty areas but may be a bit more labor intensive for the entire waterline. To clean your pool tile with a magic eraser, simply wet the sponge and scrub the dirty area.