I have several hens with varying degrees of bumblefoot. Some I have lanced and drained what I could (multiple kernels in a couple), some just soaking and wrapping. I am using propolis and am getting excellent results in terms of clearing remaining infection and healing wounds.
After soaking and attending to the degree of need of the infection, I cover the foot in propolis, fit a piece of propolis-saturated gauze to the lesion, and use Co-Flex to secure it in place. The reovery and healing process is surely being moved along by the propolis, though I am also adding Duramycin to the water for one week, just for added assitance and attempting to stop any additional spreading of the infection.