Time to clean Harvey
About the only way to clean the cap,is with a long brush or what you are doing. When climbing up, be sure not to flex the fiberglass and go up as far as necessary to reach.
I wash the top part of the overhang when I wash the roof and about a third of the overhang by lying on my belly and reaching over. Clean the remainder with either a brush or ladder as you depended on how dirty it is.
Short of scaffolding, not much else you can do.
The long brush works well but, it's difficult for me to clean around my old style clearance lights.
Just be careful, nice and slow gets the job done.
2014 Sunseeker 3170 DSF
Dorothy, Garrette and Miss Bella.
Retired and having fun.