Why Driveways & Sidewalks Turn Black (Stains and how to clean them)
- Jeffrey Kirkwold
- Mar 12
- 1 min read
Updated: Mar 13
Many homeowners notice that their concrete driveways gradually turn dark or develop black stains over time. This discoloration is often caused by algae, mold, and environmental pollutants that accumulate on the surface.
Moisture, shade (lots of that in Minnetonka), and organic debris create ideal conditions for algae growth. As these organisms spread, they produce dark stains that make driveways appear dirty even after rain.
Pressure washing is one of the most effective ways to remove these stains. High-pressure water combined with specialized cleaning techniques can restore concrete surfaces and remove years of buildup.
Regular exterior cleaning helps prevent permanent staining while maintaining the appearance of driveways and sidewalks.
Professional pressure washing can dramatically improve the curb appeal of your home.
Visit our pressure washing services detail page for our offerings. Another great read is our Complete Guide to Pressure Washing Your Home.
