How To Remove Silica Buildup on Toilets and Glass Shower Doors

Silica is the most abundant mineral in the earth's crust. It's an oxide found in nature as sand or quartz, and in most types of glass, as well as concrete. It's used to absorb water in food and is used in toothpaste to remove plaque. Though it's useful for many things, silica is difficult to remove when it forms deposits on toilets and glass shower doors. Steam acts as a good solvent for silica, and can cause it to evaporate along with water. This leaves a scaly residue, but with the right products and elbow grease, it can be removed.

Things You'll Need

  • Limeaway

  • CLR

  • White vinegar

  • Amaz

  • Water repellent

  • Scrubbing pad

  • Calgon

  • Baking soda

  • TSP

  • Lemon juice

Step 1

Use Limeaway, a hard-water mineral remover. Hard-water mineral removers remove the deposits of minerals like calcium, magnesium, and silica that are left on toilets and glass shower doors when hard water evaporates. Available in liquid and spray form, they contain citrus, oxalic, hydrochloric or other acids to dissolve the minerals and prevent future buildup. CLR is another product that works well.

Step 2

Add 4 tbsp. of trisodium phosphate (TSP) to 1 gallon of water. Scrub to remove the silica buildup, then rinse well with water.

Step 3

Dissolve 4 tbsp. of baking soda in 1 gallon of hot water to remove silica buildup from toilets and glass shower doors. Rinse immediately with white vinegar. Repeat.

Step 4

Apply Amaz, available from, to glass shower doors and toilets. Use the scrubber that comes with it to rub silica buildup. With a lot of elbow grease, the silica buildup should come off.

Step 5

Add 1 tsp. of Calgon to 1 gallon of hot water. Scrub the silica buildup. Rinse well with lemon juice and water.


Apply two coats of a water repellent made for car windows.


Use non-abrasive scrubbing pads and cleaners to avoid scratching glass shower doors.