07/15/2026
That green and black film creeping across the north side of your house is not just dirt. It is algae and mildew, and the July humidity across Michiana is exactly when it takes off.
The shaded side of a house never fully dries out in summer. Moisture sits, spores settle, and within a season you have that dark streaky film across your siding. Pressure washing alone knocks off what you can see, but the spores stay on the surface and it comes right back. When our crew soft washes, we apply a mix of water, soap, and bleach at low concentration that kills the organic growth at the root. The bleach does the work, not the pressure. That means your vinyl, Hardie board, or painted wood siding stays undamaged and stays clean longer.
We are seeing the same thing on driveways this time of year. A full summer of heat, foot traffic, and afternoon storms leaves concrete looking grey and tired. We follow up the house wash with a thorough concrete clean on most jobs, and the difference in curb appeal is hard to miss.
If your roof has black streaks running down the shingles, that is the same organism. We soft wash that too.
Double A Power Washing serves Mishawaka, South Bend, Granger, Elkhart, and lake communities across Michiana. Call (574) 221-8400 or visit doubleapowerwashing.com for a free estimate.