Yes, cleaning walls and trim is an essential step before painting. Dust, dirt, and blemishes may impede paint from bonding effectively to the surface, leading to an inconsistent outcome.

Cleaning the walls before painting ensures that the paint will adhere well and last longer.

What is the Best Way to Clean Walls Before Painting?

Using mild soap and warm water is the optimal method for cleaning walls in preparation for painting.  First, dust the walls using a soft-bristled brush or a vacuum cleaner with a brush attachment. 

Proceed by applying a sponge or a delicate cloth to scrub the walls with soap and water, beginning at the base and gradually ascending. Be gentle while cleaning to avoid damaging the walls.

How to Wash Walls Before Painting?

Vacuum Walls Before Painting

To wash walls before painting, follow these simple steps:

  1. Remove dust or cobwebs using a soft-bristled brush or a vacuum cleaner with a brush attachment.
  2. Mix warm water and mild soap in a bucket.
  3. Dip a sponge or a soft cloth into the solution and gently clean the walls, starting from the bottom and working your way up.
  4. Rinse the walls with clean water using a slightly damp cellulose sponge or a fresh cloth.
  5. Allow the walls to dry completely before painting.

Can You Paint Over Unwashed Walls?

While it is possible to paint over unwashed walls, it is not recommended. Modern paints can bond well to almost any surface but adhere best to clean and smooth surfaces. 

Painting over unclean walls can lead to suboptimal paint adhesion, causing an inconsistent finish, flaking, or crumbling.

Key Takeaways:

  • Cleaning walls before painting is essential to ensure the paint adheres well and provides an even finish.
  • Warm water and mild soap are the best ways to clean walls before painting.
  • Dust the walls first before cleaning them with soap and water solution.
  • To prepare for painting, rinse the walls using clean water and allow them to dry out entirely.
  • Painting over unwashed walls is not recommended, as it can result in an uneven finish, peeling, or chipping.

We offer various interior painting services, and our local interior house painters are experienced and knowledgeable about the latest trends and techniques.