The Matt Chem Chalkex propeller and hull cleaning spray is a very powerful cleaner that contains corrosion inhibitors, easily and quickly removes barnacles, zebra mussels, algae, and residues. Additionally, it has a biodegradable formula and is specially designed for a quick and effective solution for cleaning the propeller and hull. 

Instructions for use: It is ready to use. Simply spray and let it act for a few minutes. Then rinse with a pressure washer. If necessary, repeat the process.