We do apologize but do not have information on cleaning the Opus Hummingbird Feeder 20 oz. (476), you may try reaching out the manufacturer at 855-737-5973 for assistance
Please let us know if you need anything else.
We currently don't carry accessories for the Opus Hummingbird Feeder 20 oz but our product specialist would be happy to help us check to see if we can carry that for you. Feel free to give us a call. We're available Monday - Friday 9 am to 5 pm EST at 866-581-7378.