There are chemicals available in pool stores to help remove film or light mineral deposits. Once mineral deposits become thick you can use pumice. If that doesn't work or is too difficult you may need a professional. There are several methods they use. The oldest is probably mechanical devices like wire wheels or grinders. They can scratch the surface. Then there are glass bead blasters that use air pressure to blast the deposits off. Beads may cause pitting and dulling of the surface. The latest method (about 5 yrs old) is water pressure used to propel mineral salts at the surface. Since the salts are softer than the tile they never cause damage.
Grout.
normal
To lay pool tiles, you will need mortar to affix the tiles to the cement pool, you will also need grout for between the tiles and a sponge to clean the tiles.
If they are ceramic tiles and this is the adhesive used to bond them, instructions will be on the container.
there is a special cleaner at lowes in the cleaner isle.
With a mop or a vacuum cleaner?
Use Tilex, it's amazing.
Acetic acid (vinegar)
One recommended way to clean the tiles in showers is to use "Jomax Mold and Mildew Stain Remover." This specific brand is great for weekly use around the bath and shower.
Glass tiles are surprisingly tough, at least as impact resistant as many ceramic tiles. They are easy to clean, but the most common reason for using glass tiles in a design is the wide range of vibrant colors. On the downside, they are generally smaller, which means more grout lines, which can be difficult to clean.
Marble shower tiles need no special cleaners. Wiping down the shower every day with a medium sized towel will keep the marble shiny and clean. If there is a build up of lime, the marble can be cleaned with a soft cloth and a little vinegar and water, then rinse well. Never use a brush to clean marble tiles.
Grouting brush is a cleaning supply used to clean tiles.