The Muc-Off Disc Brake Cleaner features 400ml of a unique formula with added conditioners that re-hydrate the disc brake pads to dramatically reduce brake squeal and prolong the disc pad life. The recipe contains 'split-fibre' technology to increase surface area absorbency and eliminates smears or blemishes, evaporating quickly to leave the disc brake rotor with a perfectly clean, uncontaminated surface.