Fs 1 concentrate is a unique complex blend of biodegradable liquid raw materials that leaves surfaces exceptionally clean and uncontaminated no other cleaner comes close to its ability to clean safelyengineered at a sub nano molecular level fs 1 contains no solid particles of any size that would otherwise drop out or be left behind after cleaning and rinsingfs 1 does not containcaustics acids solvents metasilicates abrasives or siliconfs 1 is safe to use onshock units disc brakes aluminium