Cleaning the vinyl strip covering the endcap to body joint
Thanks to Covid, we haven't taken the 2307 anywhere for 18 months - despite bringing it home for cleaning and maintenance a couple of times, the exterior got really, really dirty.
With an extended trip coming up (meeting our daughter & her family in Yellowstone, then on to Mt Rushmore) it was time for a thorough cleaning, including polishing and waxing the outer skin & molded endcaps. During that project, discovered that what first appeared to be mostly dirt on the vinyl sealing strip that covers the joint between the endcaps and the roof and body of the trailer was actually surface discoloration - probably UV damage.
After working through several cleaning products, finally hit on a means of bringing those strips back to a nearly new appearance: scrubbing with "Soft Scrub" cleanser (original formula with bleach) & a Scotchbrite pad, followed by a wipe-down with Vinylex vinyl protectant. The combination of the mild cleanser and Scotchbrite cleans away the "dead" top surface of the vinyl strip, the beach in the cleanser removes residual discoloration, and the Vinylex helps protect tha surface from further damage.
A couple of minor cautions - keep the Scotchbrite off the fiberglass endcaps (the combination of the cleanser and pad can put fine scratches in the 'glass) and rise off the cleanser residue as you go.
Attached photo is of one of the vinyl strips half-way through the cleaning process - before starting, the strip was the same brown color almost to the bottom...
2307C / 2002 GMC Sierra 1500 ext cab (BellTech lowering kit, AirLift load-lifter air bags on rear axle, on-board compressor)