Bike Disc Brake Cleaner | Clean Rotors the Right Way

A bike disc brake cleaner should remove oil and grime from the rotors without leaving residue that could reduce braking friction or contaminate the pads. Apply isopropyl alcohol or a purpose-made cleaner with a clean, lint-free cloth, avoid touching the braking surface with bare fingers, and keep chain lubricant and drivetrain degreaser away from the brakes. If squealing or weak braking continues after the rotors are cleaned, inspect the pads for glazing or contamination and replace heavily contaminated pads before riding.