... my 25 year old operable Bomar port lights have inserted rubber ribbed gaskets about 3/8" wide for the seal. They all are in good condition. I usually just clean them with warm soapy water and a nylon (tooth) brush. Wondering if there is some kind of conditioner or product that will keep the rubber supple & soft, yet not attract any dirt or dust ? I think if I rubbed on then off some DOW 111 silicon grease or similar, it would attract lots of gunk between the ridges ?

thanks, cheers, John