I see 2 options. 1) Wiggle & tug & push gently on handle till it lets go. Be sure to be hooked up for dumping if it frees up.  2) Get somewhere you can dump freely on ground or be able to clean up afterwards. Put on some old clothes, facemask, & a snorkel and start undoing the 4 bolts that hold the valve in place.  Good luck in the endeaver of your choice. i hope option 1 works out for you. I had to do option 2, but my tanks were clean.
Ricky
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I know the voices in my head aren't real, but some of them have pretty good ideas.
AIR 22749
1974 25' Tradewind - no TV yet
1989 345 LE Classic Motorhome
Courtesy Parking; 20 amp, water, dump, wifi
'tween exits 27 & 33, I-75 | 
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