How To Clean Stone Retaining Walls
1. Wash with a hose
We recommend starting with this so you don’t have to rent and operate a pressure washer.
Hoses work for retaining walls that are less dirty. It’s best to have a sprayer attachment. You can cover the nozzle with your thumb in a pinch to get a harder spray.
2. Wash with a pressure washer
This is for the dirt that just doesn’t seem to want to get off of your wall.
We recommend keeping the PSI below 1,500. It’s best to keep the nozzle at least 6-inches away from the stone retaining wall. Combined, this should clean your wall without damaging it.
3. Scrub your stone retaining wall
This is for those stubborn stains and dirt clods. A hard-bristled scrub brush and some elbow grease should do the trick. Scrubbing while the wall is wet helps keep the dirt from getting driven into the cracks.
*For stubborn stains, you can mix dish soap with water and use that as you scrub. If that doesn’t work you can use a water and bleach mixture.