Always test on an inconspicuous area before use. Do not use on limestone, travertine, marble or other surfaces that contain lime. Read the safety information below carefully before use and ensure the required personal protective equipment (PPE) is used. For descaling sanitary fittings, shower heads, baths, etc: Dilute 1 part cleaner to 1 part clean water. Apply the solution to the area to be cleaned and allow up to 10 minutes contact time. Rinse or wipe with a clean damp cloth. Tough build up may need a second application. Product may be applied neat to areas of heavy limescale deposits. For rust stain removal: apply neat, work in to the stain with a non-abrasive brush or scourer. Allow up to 10 minutes contact time then wipe away with a clean damp cloth.