I have this problem also. Unfortunately on a Wikdcat 28RKS these valves are buried above the insulation that encloses the frame and are not readily accessible. I've tried dumping the stuff into the tank but the vegetable oil sounds interesting.
Floyd & Carolyn
2012 F150 S/crew 4X4 6.2L 6Spd Tow Max Firestone airbags.
2011 28RKS Wildcat. Yamaha 3000iseb Generator.
2013 22 nights.2014 57 nights.2015 116 nights +14300KM
2016. 63 nights