Best Pressure Washing Detergents Recommended for Concrete

Samaritan Light Team

April 28, 2026

3 min read

Why You Need More Than Just Water

Pressure washing with plain water can remove dirt, but it often leaves behind mold spores, deep oil stains, and rust. To get a truly clean surface that lasts, you need the right chemical solutions.

Top Detergent Types

• Sodium Hypochlorite (Bleach): The industry standard for killing organic growth like mold, mildew, and algae. It's highly effective but must be used carefully and diluted properly to avoid damaging plants.
• Degreasers: Essential for driveways and garage floors. Alkaline-based degreasers break down oil and grease so it can be easily washed away.
• Oxalic Acid: The go-to solution for rust stains and hard water spots. It's often used as a secondary treatment after the main wash.

Application Tips

Always apply detergents from the bottom up to prevent streaking, and let the solution sit (dwell time) for 5-10 minutes before rinsing. Never let the detergent dry on the surface!