X2on the Calgon and Purex laundry detergent. Now that you got it to drain, I'd do the Calgon/Purex/deodorizer of choice/water/bag of ice combo, go for a drive, and let that mixture scrub out the inside of your tank. The dump again, refill with clean water, dump again, and you should be GTG!
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)25
2014 Harley Davidson FLHX (XLR cargo)
2014 VW Jetta TDI (diesel sipper, camping support vehicle)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)