Clean it out thoroughly periodically and completely empty it and rinse out very frequently to deter mosquitoes from using it to breed. In my area, there can be mosquito larva wiggling around within 3 days of putting out containers of water, not sure about how long it takes in other areas. During mosquito season I keep reminding myself about checking my wildlife water containers these days. Right now, my water containers put outside the fence usually go empty overnight. With temps very high here and no rain in a couple of weeks all the animals are thirsty.
