OP back, Well I tried a few things that were suggested and a few that weren't and still n/g.
Tried the toilet chemical trick by placing a few oz's into a hose extension and pumping into the sprayer and letting it sit for awhile. Took the vacuum breaker/back flow preventer out from under the sink and it's associated 32' of PEX plumbing and made a direct connection between the outside hose end fitting and sprayer. Purchased a cleaning wand from CW and cleaned the heck out of the tank, all for naught....Can't use the air pressure trick because there is some water flow through the flush head.
Now as with most of my camper fix-it projects I made things worse, now I had a leak in my black tank when using the flush. I had water pouring out from under the Cloroplast under belly after I was done
I went under the camper and listened to where the water was hitting the belly and made a slit in the Cloroplast and sure enough I found out where my flush enters the black tank (opposite side of camper from flush connection, something I always wanted to know
).
I found the white plastic collar was loose on the right angle PEX fitting that attaches the sprayer to the tank, dodged a bullet there. AND I learned that the the edges created by slicing into the Cloroplast are far sharper than any knife I own. Had to call nurse Nancy and told her to bring some band-aids, and listen to her usual "I told you so" message.
So, for the time being I'm going to live with it. If I ever get the ambition to try and fix it again I'll just make a bigger hole in the under belly cover buy more band-aids and pull the freaking flush out of the tank and clean it out that way.
Yeah right.......
Ron W.