You should aim to wash your walls once a month. This way, you can avoid having allergens, dust, grease, dirt, or stains build up on your walls over time. If you pay for the cost of a housekeeping service, typically $15 to $40 per hour, you can save between 15% and 20% by adding on monthly wall washing instead of paying for a deep wall and ceiling cleaning once or twice per year.
The best way to clean walls depends on how dirty they are and what their texture is. Walls have different surfaces and textures that require specific cleaning products. Before you start washing your walls, research what they need and spot-test a small area. Generally, the best way to clean your walls is to mix a gentle cleaner with water in a bucket. Then, take a mop or sponge and gently scrub your walls up and down until clean.
Yes, you have to dry the walls after washing them. Otherwise, they may dry with spots and streaks from the cleaning solution—or worse—stay wet for too long and attract mold or harbor bacteria growth. Make sure you take a clean cloth and dry your walls thoroughly.