Just in case someone else really needed a solution. NOTE: Only works if you have a small amount of waterers, or a LOT of time on your hands. My 1-gallon plastic waterer got algae in the swirly part that keeps the base and jar together. UGH. Water won't wash it out because the entrance in that area is too small. It's really not that hard to clean it out, just requires a bit of thinking that sometimes we are too lazy to do. Needed: 1 paper towel 1 toothpick 1. Rip off a small section of the paper towel. 2. Wet the paper towel with water. 3. Wrap the end of the toothpick in the wet paper towel. 4. Insert toothpick into green area. 5. Follow the groove. 6. Repeat. Ta-da! Your waterer is now clear again.