To keep the interior panels clean, just wipe them with a damp cloth. If they still have spots (which is more noticeable on light panels), rub them thoroughly with a soft nail brush using liquid detergent. Do not forget to keep the ceiling upholstery clean in the same way. It is recommended to apply a high quality rubber and vinyl protector after cleaning to prevent oxidation and cracking. The same agent can also be applied to sealing strips, vacuum tubes and rubber hoses, which often suffer from chemical degradation, as well as tires.