Cemstrip will also remove salts and efflorescence from the surface of mineral substrates and is a very effective general cleaner for removing ingrained dirt, grease and stains from paths and patios. Highly concentrated formula that can be diluted by up to 10 times with water to suit a variety of applications. Unlike hydrochloric acid based products Cemstrip can be safely used on most metal surfaces such as tools, cement mixers and other building equipment. Cemstrip is Non-hazardous in storage, transport and usage. It is also fully biodegradable.