Cleaning the spray nozzle (your 10 gallons of water and dawn soap) may be the trick.
We had similiar situation, sprayer non functioning. We were stationary, so filled black tank with a LOT of water, up to the top, over night, with calgon (which will help disolve stuff) and probably some soap as well (don't quite remember). Next AM, drain, tried sprayer, a bit better. I believe (memory bit foggy--sigh), that we did this a couple of nights in a row.
Anyway, it eventually soaked whatever was plugging the nozzle and plug was dislodged. It was our guestimate that it was dried something or other. Debris that dries in the tanks is like concrete, amazingly hard.
HamRads suggestions are good too!
Good luck, let us hear what works for you.
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