Once a year
When warm weather arrives, it's time to de-grime and let the fresh air in.
1. Take screens out to the yard and spray them with a garden hose. (Remember to mark them so you will recall which windows they fit.)
2. Gently scrub the screens using a nylon-covered sponge and a cleaning solution of one part ammonia and three parts water.
3. Rinse with the hose and leave screens outside to dry in the sun.
No yard? Lay a drop cloth or blanket in your bathtub and place the screens on top. Clean the screens and hold them under the showerhead to rinse. If your tub is too small for the screens to lie flat, rest the bottom edges on the floor, placing them on an old towel. Spot-clean each screen using a nylon sponge and a squirt of window cleaner, then do the reverse side. Let screens air-dry.
Psst! Before you put the screens back, clean the tracks in the window frame. Wrap strips of soft cloth around the tip of a screwdriver, dip it into soapy water and swab each corner and crevice.