Grout Haze Cleaner can be used both indoors and outdoors, after installation or during construction. Suitable for all types of acid-resistant surfaces, including ceramic tiles, porcelain, brick, clay and quarry tiles, terracotta, concrete, and other natural stones. Effortlessly removing surface residues such as efflorescence, mortar and cement, encrusted and engrained dirt, rust, and calcium & limescale deposits. Coverage is determined by whether the contamination is used neat or diluted up to 1:10 with water. Available in 1L and 2.5L. HOW TO APPLY: 1. Remove any dust and debris from the work surface before beginning, and make sure you have adequate personal protection, such as gloves , appropriate protective eyewear , a face mask , and clothing. 2. Prior to use, we always recommend performing a small test application in an inconspicuous area. This will indicate the product's suitability and effectiveness for your surface. 3. Grout Haze Cleaner can be used neat or diluted up to 1:10 with water, depending on the level of contamination. 4. Before applying the cleaner to the stained area, wet the space with clean water. Allow the cleaner to sit for a few minutes, before disturbing and rinsing thoroughly with clean water. 5. If necessary, repeat process; if using the cleaner indoors, proper ventilation during and after use. PLEASE NOTE: Grout Haze Remover should not be used on or near acid-sensitive surfaces such as enamel, zinc, chrome, stainless steel, polished marble and limestone, and so on.