Dust or vacuum the walls first
Fill a bucket with warm water and mild dish soap
Test the cleaning solution on a small hidden area
Dip a soft sponge or microfiber cloth into the solution
Wring out excess water
Scrub the wall gently in small sections
Rinse the sponge or cloth often
Use a clean damp cloth to wipe away soap residue
Dry the wall with a soft towel or allow it to air dry
Repeat on stubborn spots as needed
Avoid soaking the wall
Avoid abrasive scrubbers on painted surfaces