A clean walls makes a bigger difference than you'd think. Here's the most effective method, plus the mistakes most people make.
Wipe walls top to bottom with a dry microfiber cloth or duster to remove cobwebs and dust. This prevents mud streaks when you add water.
Fill one bucket with warm water and Vibes Multi-Surface Cleaner. Fill the second bucket with clean rinse water.
Working in sections from bottom to top (this prevents dirty drip streaks), wipe with the soapy solution using a soft sponge.
Wipe each section with the clean rinse water, then dry with a microfiber cloth to prevent water spots.