Hydrochloric acid, 500 ml

Brand- -. Weight- 0.5 kg. Use- Dilute hydrochloric acid 1:3 with water, apply to the surface to be cleaned with a brush, and wait for it to react (until bubbling stops). When diluting, carefully pour the acid into the water! Scrub off cement residues or moss deposits with a stiff brush and rinse the surface thoroughly. If necessary, repeat cleaning.