Get long Q tips, dip the end in straight muriatic and carefully wipe on affected nikasil'd surfaces only. It'll dissolve any aluminum stuck to the nikasil, as well as any other aluminum surfaces it touches. Avoid skin contact and don't breath the smoke produced as it dissolves the aluminum.Tide said:How do you clean aluminum out of a cylinder. I now you use muratic acid. do you have to scrub? what do you srub with? do you use it stright?