Dishwashing detergent. Dawn (IMHO) is best. Silicone is forever. Spray bottle of dish soap and water mixture.

BTDT.

Silicone? Nononononononono. I may want to paint the van one day. Silicone = fisheyes.

Jim

> On Apr 22, 2015, at 3:15 PM, Stuart MacMillan <stuartmacm@gmail.com> wrote:
> 
> Two people, an oil saturated 1/4" cotton rope, and the real trick, liberal application of silicone spray to both the rubber and the opening.