snapmyapp wrote:
:/ we get a toilet scrubber and keep it out at the barn, and EVERYDAY when we're watering we scrub the buckets, and it seems to keep it down... we also dump waters out when their below half and do a complete cleaning of them or if they are dirty..... :]

Ditto.
We also have an aquarium fish net that we use to scoop out leaves and stuff in between bucket scrubbings.