Trisodium phosphate (TSP) is the inorganic compound with the chemical formula Na3PO4. It is a white, granular or crystalline solid, highly soluble in water, producing an alkaline solution. TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser.

TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser.

Power through accumulated layers of dirt, grease, grime, soot, and stains on exteriors—notably masonry (brick, stone, cement, and concrete), wood (decks and siding), and roofing.

When prepping for a paint job, TSP can clean and de-gloss painted surfaces and remove peeling, flaking old paint.

Inside the house, TSP works well on the stubborn sort of grease-meets-dirt gunk typically found after pulling an old stove or fridge away from the wall.

Though it shouldn’t be used to clean grout, TSP can be used to remove it; TSP is an active ingredient in grout removal products.

TSP can safely be mixed with bleach to remove mold and mildew (see below for measurement guidelines).

Trisodium phosphate (TSP) is the inorganic compound with the chemical formula Na3PO4. It is a white, granular or crystalline solid, highly soluble in water, producing an alkaline solution. TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser.

TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser.

Power through accumulated layers of dirt, grease, grime, soot, and stains on exteriors—notably masonry (brick, stone, cement, and concrete), wood (decks and siding), and roofing.

When prepping for a paint job, TSP can clean and de-gloss painted surfaces and remove peeling, flaking old paint.

Inside the house, TSP works well on the stubborn sort of grease-meets-dirt gunk typically found after pulling an old stove or fridge away from the wall.

Though it shouldn’t be used to clean grout, TSP can be used to remove it; TSP is an active ingredient in grout removal products.

TSP can safely be mixed with bleach to remove mold and mildew (see below for measurement guidelines).