Contamination is caused by dust getting between the brake pads and brake discs with normal everyday driving. As the dust builds up it scratches the face of the brakes and wears away pads to a point where braking is difficult and requires more use of the emergency brake.
When cleaning the brake pads you can gently wipe away any residue that you can see using a soft cloth. Apply copper slip to the components to seal the damage. Copper slip is used in mechanisms and machines on static parts that should not move. Moving parts include bearings where lubrication is required. Copper slip also helps to prevent the squealing sound when you apply the brakes. It also helps to prevent a seizure. This can damage the system badly causing you to have irreparable brakes and discs.
Once you have applied the copper slip on both parts you should test it to see if your handy work helped. You can drive the car and slow down until you feel it braking hard. It is suggested that you wait for some white smoke to come from the brakes. This means that the excess has been removed thus you no longer have contaminated brakes and you can drive safely.
You don’t have to remove any components in order to apply the copper slip as this would require professional help and tools. It isn’t a necessary step as the copper is there to prevent oxidation.