"arboldt".....On my 2005 Monaco Diplomat, I ran into the same issue. Toilet paper would collect in the sprayer nozzle tip when the tank would be nearly full. Once the tank was emptied, the toilet paper would dry hard like paper mache, clogging the head.
You'll need to pull the panel in the bay, on the passenger side of the coach, opposite the tanks. Then look for a garden type/size hose feeding a plastic nozzle, about an inch or so in diameter. On my Diplomat, it was a pain to remove the nozzle and soon clogged again. I finally, disconnected the hose, leaving the nozzle in place and used an 1/8" drill and just drilled several holes in it, through the hose connection opening. I didn't really care if it no longer had a directed spray, I just wanted it to push water into the tank for rinsing.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor