Dust the wall with a dry microfiber cloth or soft duster
Vacuum the wall using a soft brush attachment
Mix a small amount of mild dish soap with warm water
Dampen a soft sponge or microfiber cloth with the solution
Wring out excess water so the cloth is barely damp
Test the cleaner on a hidden spot first
Gently wipe the wall in small sections
Avoid scrubbing or using abrasive pads
Rinse the cloth with clean water and wipe again if needed
Dry the wall with a clean, soft towel
Use a magic eraser only very lightly and only if necessary
Spot-clean stains as soon as possible
Avoid harsh chemicals, bleach, ammonia, and strong degreasers
Avoid soaking the wall with water