Vosimox is a concentrated acidic cleaning product to remove cement/concrete, lime pollution.
Tiles and stone.
Also removes (fly) rust from the surface.
Dilute with water:
Light to moderate pollution: 1:10
Moderate to heavy pollution: 1:5
Heavy pollution: 1:3
Apply Vosimox solution with a sprayer over the surface, if necessary, use a brush or pad. Let it sit for 10 to 15 minutes, but don't let it dry. Rinse the surface with plenty of water. For extreme pollution, use a pressure sprayer.
If necessary, repeat the application.