Feathers and bird droppings can clog the inside of a window air conditioning unit and cause it to malfunction. If you have noticed that pigeons have been perching on the portion of the unit that rests right outside your home's living room window, clean the unit and discourage the birds from coming back with the following tips. 

Materials

• broom
• water hose
• scrub brush
• bucket of warm, soapy water
• spray bottle 
• vinegar
• wet/dry vacuum cleaner
• measuring tape
• piece of wood
• pencil
• power saw
• metal pie plates
• hole puncher
• twine

Remove Surface Stains And Vacuum The Vents

Brush feathers and loose debris from the unit's exterior with a broom. Use warm, soapy water and a scrub brush to remove surface stains that are on the metal's surface. Move the brush back and forth vigorously to loosen bird droppings and other stubborn stains. If any of the stains are large and you have trouble removing them, spray some vinegar on them and allow it to penetrate for a few minutes before loosening them with a scrub brush. Vinegar is a powerful cleaning agent and naturally eliminates foul odors.

Once the unit's exterior is clean, rinse it off with a water hose. Place the hose from a wet/dry vacuum cleaner over the vents that run across the back of the unit to suck up water, feathers, and any other debris that is trapped between them. 

Discourage Pigeons From Coming Back

Discourage the pigeons from perching on the unit by making it difficult for them to land. Measure the length of the unit. Cut a piece of wood, at a slant, that is the same measurement. Place the wood on the exterior portion of the unit so that the slanted side is facing upwards. Pigeons prefer to land on flat surfaces and won't be likely to attempt landing when they spot the wood.

Clean a couple pie tins with soapy water. Use a hole puncher to insert a hole through the edge of each one. Cut two pieces of twine that are a few feet long. Insert the end of each piece of twine through one of the holes and form knots with them. Tie the other ends of the twine to sturdy objects that are located near the unit. When the pigeons see the shiny metal tins swaying back and forth when it is windy outside, they will avoid approaching them. Pigeons tend to stay away from objects that reflect light and move.

Continue to use the wood and tins to deter the pigeons on a regular basis and you won't have to worry about the birds appearing on your air conditioning unit again.

For professional help, contact a service like Mike's Bremen Service Inc.