What to spray on a driveway before pressure washing?

What to spray on a driveway before pressure washing?

For routine dirt and general grime, a biodegradable, pressure-washer-safe all-purpose detergent applied with a pump sprayer is the standard pretreatment, giving the cleaning solution time to chemically break down buildup before the pressure washer does the physical work of rinsing it away. For oil stains specifically, a dedicated concrete degreaser outperforms general detergent significantly, since it’s formulated to target petroleum residue rather than just surface dirt. For algae or mildew staining, a bleach-based or specialized biological cleaner works best. Whatever you choose, apply it evenly across the surface and let it dwell for the time specified on the product label, typically 10–15 minutes, without letting it dry completely before rinsing, since a fully dried solution can actually become harder to remove than the original stain.