A clean window sills makes a bigger difference than you'd think. Here's the most effective method, plus the mistakes most people make.
Vacuum the window sill with a brush attachment to remove dust, dead bugs, and debris.
Spray Multi-Surface Cleaner on the sill and let it sit for 1 minute.
Scrub the entire sill with a soft brush. Use cotton swabs in tight corners and crevices.
Wipe with a clean damp cloth to remove all cleaner residue and loosened dirt.
Dry with a clean cloth to prevent moisture damage and water spots.