How to Clean a Bird Feeder (and How Often You Really Need To)

A bird feeder brings many birds to one small spot, and that is exactly why it needs regular cleaning. Droppings, wet seed and moldy hulls build up where birds gather, and some of the diseases that spread between backyard birds travel through shared feeders.

The good news is that cleaning is quick once you have a routine. This entry covers how often to clean, how to do it safely, and what to do if you see sick birds.

Why cleaning matters

The National Audubon Society lists several diseases that birds can spread at feeders, including house finch eye disease (mycoplasmal conjunctivitis), salmonellosis, the fungal disease aspergillosis and avian pox, in its guide to keeping feeders disease-free. Feeders concentrate birds, so a single sick bird can expose many others.

Cleaning will not make a feeder sterile, but it removes the buildup of droppings, mold and spoiled food where germs thrive.

How often to clean each type of feeder

Feeder type	How often	Notes
Tube and hopper seed feeders	About every two weeks	More often in wet weather, heavy use or if sick birds appear
Platform and tray feeders	More often than tube feeders	Droppings land directly on the food; remove wet seed daily
Suet feeders	When suet is replaced, and whenever it looks spoiled	Avoid soft, rancid suet in summer heat
Hummingbird feeders	Refill with fresh nectar about twice a week	Clean right away if the nectar turns cloudy or moldy
Birdbaths	Change water often	Scrub when algae or droppings build up

The two-week guideline comes from the Cornell Lab of Ornithology's All About Birds, which recommends cleaning more often during heavy use, wet weather, local salmonella reports or if you see sick birds. Clemson University's Home & Garden Information Center gives similar advice for washing bird feeders, and suggests filling hummingbird feeders with fresh sugar water twice a week.

What you need

Rubber gloves
A stiff brush and a bottle brush for tube feeders
A bucket or sink you can disinfect afterward
Unscented dish soap
Regular household bleach, if you choose to use a bleach soak
A place to let feeders dry completely

Wash feeders outdoors or in a utility sink rather than the kitchen sink you use for food, and wash your hands well when you are done.

Step-by-step: cleaning a seed feeder

Empty the feeder and throw away old seed. Do not mix old seed with new.
Take it apart as far as the design allows: base, perches, ports and lid.
Scrub off debris. Remove caked seed, droppings and hulls with a brush and hot soapy water. Bleach does not work well on surfaces still covered in debris.
Disinfect. Cornell's All About Birds says you can use a dishwasher on a hot setting, wash with soap and boiling water, or use a dilute bleach solution of no more than 1 part bleach to 9 parts water. It notes that research suggests a 10-minute soak in dilute bleach is very effective after scrubbing.
Rinse thoroughly with clean water until there is no bleach smell.
Dry completely in the sun before refilling. Damp seed molds quickly.
Refill with fresh seed and put out only as much as birds will eat in a few days.

Cleaning hummingbird feeders

Sugar water ferments and grows mold quickly in warm weather, so hummingbird feeders need more frequent attention than seed feeders.

Empty the old nectar and rinse the feeder with hot water.
Use a small bottle brush on the reservoir and the feeding ports, where mold hides.
If you use bleach, Cornell advises rinsing thoroughly and letting the feeder air-dry before refilling.
If you see cloudy nectar, black specks or mold, empty and clean the feeder right away, even if it is not your usual day.

Make fresh nectar with plain white sugar and water. Audubon's hummingbird nectar recipe uses 1/4 cup of refined white sugar dissolved in 1 cup of boiling water, cooled before filling. It warns against substituting honey, which can promote dangerous fungal growth, and against red food coloring.

Clean up under the feeder

Spilled seed and hulls on the ground attract rodents and can carry disease to ground-feeding birds such as doves and juncos. Audubon, citing Project FeederWatch, recommends raking or shoveling up droppings and hulls, especially when they are moldy or wet.

A few habits help:

Move feeders a short distance every so often so waste does not pile up in one spot.
Use a tray under the feeder to catch hulls, and empty it regularly.
Choose no-waste mixes or hulled seed if spills are a constant problem.

Spread birds out

Disease spreads more easily when birds crowd together. Audubon notes that spreading food among several feeders gives sick birds fewer chances to contaminate others. If you have room, two or three feeders spaced apart can be healthier than one busy feeder.

When to take feeders down

If you see birds that are lethargic, fluffed up for long periods, have crusty or swollen eyes, or seem unafraid of people, take your feeders down. Clean them thoroughly and wait before putting them back, so healthy birds disperse rather than gathering where sick ones are feeding.

Audubon advises not to pick up or try to treat a sick bird yourself. Contact a licensed wildlife rehabilitator or your state wildlife agency, which can also tell you whether there is an outbreak in your area.

A cleaning routine you can keep

Put a recurring reminder on your calendar every two weeks for seed feeders
Refresh hummingbird nectar twice a week in warm months
Rake up hulls and droppings under feeders when you clean
Keep a spare feeder so one is always clean and dry
Watch for sick birds and take feeders down if you see them

Frequently asked questions

Can I clean a bird feeder with vinegar instead of bleach?

Vinegar and water can help remove residue and is often used for hummingbird feeders. Cornell's guidance for disinfecting seed feeders mentions a hot dishwasher cycle, soap and boiling water, or a dilute bleach soak. Whatever you use, scrub first, rinse well and dry completely.

Is it okay to just top off a feeder without cleaning it?

Topping off is fine between cleanings, but old seed at the bottom of a tube feeder can get damp and moldy. Empty the feeder completely at each cleaning.

Should I stop feeding birds in summer to prevent disease?

You don't have to, but warm, wet weather makes cleaning even more important. If you cannot keep up with cleaning, it is better to put out less food or take feeders down for a while.