Most of our hummingbird feeders are dishwasher safe (on the top rack only) and are so noted on the product label. However, this method is only recommended for general upkeep. If a rinsed-out feeder has a moldy smell, has accumulated black spots or spoiled nectar, we recommend soaking the disassembled feeder in a vinegar solution (1 gallon water to 4 cups of vinegar) for a minimum of 1 hour, scrubbing with a bottle brush if necessary, then rinsing under a stream of warm or hot water and letting dry before reassembling.