I've had my Hellwig sway bar on for the past year and it was starting to get that "Hellwig squeak". For anyone who might encounter this, I was instructed by two coworkers who encountered the same issue to utilize the following Valvoline synthetic grease with moly (and yes it did the job and that thing is silent again). They both recommended using it liberally by greasing the sway bar at the location where the bushings ride, the inside of the bushing and the outside of the bushing as well as the inside of the inside of the U-plate. It worked like a charm and I have plenty of grease remaining if/when it occurs again. The good thing is this grease is much more resistant to water washout: