What is the best cleaning solution to use in a pressure washer?

What is the best cleaning solution to use in a pressure washer?

The best cleaning solution depends entirely on the surface and the type of buildup you’re removing. For general dirt and grime on concrete or siding, a biodegradable, low-foaming, pressure-washer-specific all-purpose detergent works well and won’t damage the pump’s injection system. For algae, mold, and mildew — especially on roofs and siding — a specialized mildew-removing cleaner or a bleach-based house wash solution used at low pressure is more effective than soap alone. For driveways with oil stains, a degreaser formulated for concrete outperforms general detergents. Avoid regular dish soap and laundry detergent long-term, since both can clog internal components. Whatever you choose, always test a small, inconspicuous area first, follow the dilution ratio on the label, and rinse thoroughly afterward — leftover residue attracts dirt just as easily as it removes it.