I know it is part number #000-043-203-48 but I can't for the life of me find the brand name of it which someone just posted within the past 30 days. I just checked the current price list and that part number was superceded to #000-043-204-38 which is the door and front hood sealant used on all the newer water cooled models.

 

After I go over the car with clear water and a mocrofibre wash cloth I get out the electric garden blower. All known points of water retention get the treatment, window rubbers, you name it. Do yourself a favour and get one of these. Imagine, you've just spent a long time cleaning the wheels, you stand back and what happens. Crud drops out of your disks all over the inside of your rims. Don't you hate that. Crank the blower up high and it's gone. Keeping these cars looking good is not rocket science, rather, common sense.