Two options then, replace or repair.
Replacement quote: GJA1711AJ-SEAL-WAIST £304.69; GJA1710AJ-SEAL-WAIST £364.63; HJA5755CC-WAIST-SEAL £153.02; HJA5754CC-WAIST-SEAL £155.95; all together £1K just for parts! Mmmm expensive!
Repair is possible if not too far gone. The waist seals are easy to remove, just carefully prise them up and they lift off. If the rubber has stuck to the paint just run a small screwdriver under the rubber. I scraped out any of the white aluminium oxide and then plenty of WD-40. Also WD-40 in the bodywork cavities. Rubbing down, aluminium primer, repainting, etc., as required. Luckily I found door replacements on eBay.
Suggest you lift off your waist seals and check their condition
Steve

