Caring for interior trim (BMW 5 Series E28)

To keep the interior trim panels clean, simply wipe them with a damp cloth. If stains do appear on them, (which is more noticeable on light panels), scrub them thoroughly with a soft nail brush and liquid detergent. Don't forget to keep the headliner clean in the same way. After cleaning, it is recommended to apply a high-quality rubber and vinyl protector to prevent oxidation and cracking. The same product can also be applied to sealing strips, vacuum tubes and rubber hoses, which often suffer from chemical degradation, as well as tires.

You can read the original on the website BMWMan.ru