Been there and done that. All of the above work. I have also used WD-40. with the water off, spray some on the ball and then open and close it. I have also taken a small piece of sticky back velcro and stuck it on a finger of a rubber glove and used that to try and clean the seal and as much of the edges of the ball as I could.
Dick and Peggy Hicks
Region 3 Director
2015 36CKTS, most of the bells and whistles
2011 RAM 3500 Laramie Longhorn Crew Cab 4X4 Long Bed, 50 gal. xfer tank