A toothbrush and a water change syphon has worked reasonably well for me. One of the softer bristle ones seems to loosen its grip without popping too many... then try to siphon out the debris floating in the water.
Have also had fair success with emerald crabs, but it's a lot like snails and hair algae. They do a good job of keeping it from getting established, but once there is a good clump, not so much. They seem to prefer the bubbles young and tender. Really fun to watch though.