Disinfect the storage container and food scoop that have come in contact with the spoiled food. Every day, rinse birdbaths and replace the water. Twice a week scrub them with a plastic bristle brush and mild dish detergent, and rinse thoroughly before refilling. Prevent diseases by taking these steps, and don't wait until you notice sick birds. Tell your neighbors who feed birds about these precautions.
Birds move among feeders and spread diseases as they go.
Feeder nectar ferments in two to three days, and fermented nectar causes enlarged livers in hummingbirds, and may have the same effect on orioles. Buy nectar feeders that come apart so that all surfaces can be scrubbed. Every two days, nectar feeders should be washed, rinsed, disinfected with the bleach and water solution, rinsed again and allowed to air-dry. I alternate two feeders, so that I don't have to wait for one to dry before putting out fresh nectar. You might decide to put out nectar feeders from May 1 to June 1, because natural sources are scarce when the hummingbirds first return from their migration and their energy resources are low.