1 Prepare safe work
Ventilate the room, put on gloves, and test the product on a hidden spot first. Do not mix products and protect children, pets, textiles, and delicate surfaces.
⚠ Warning: A wire brush and strong acid can scratch the tile and gouge the cement grout.
2 Vacuum and wash the tiles
Remove dust and the greasy film so dirty water does not get back into the porous grout.
3 Apply a paste or a purpose-made cleaner
Use a product suitable for cement or epoxy grout, leave it for the prescribed time, and do not let it dry completely.
4 Brush in small sections and rinse
Work with a medium-stiff brush, change the water often, and dry the surface so you can see the real result.
? Tip: Photograph the initial state and change only one thing at a time. That way you’ll know which check actually affected the problem.
5 Reassemble, test, and set a limit
Remove the product residue according to the instructions, dry the surface, and inspect it in daylight. If stains, smell, or moisture come back quickly, look for the source of the problem instead of repeating a stronger treatment.