Have one fitted for 8 years to my GS, only remove and clean every couple of years, hardly anything but some dust there, clean it and bob's your uncle. Be difficult for any dirt to get into the hub, as it's spinning so fast in my opinion !
I see your 'farkling illness' is as chronic as mine. Did you fit the brake pedal enlarger yet ? they are 'absolutely necessary' for trips to Tesco or the petrol station. Imagine
the carnage that could be caused if your boot slipped off the rear brake pedal through treading in dog shit. I don't know how I managed before fitting mine .