Diagnosis
The Greenworks 1800 PSI Electric Pressure Washer uses a specific set of internal seals, O-rings, and pump components designed for water and mild, specialized detergents. Harsh chemicals like bleach (sodium hypochlorite) or high concentrations of industrial degreasers like Simple Green can cause chemical degradation of these rubber seals, leading to pressure loss, internal leaks, and permanent pump failure. Furthermore, bleach is corrosive to the metal components and the detergent suction tube.
How to Fix It
To safely clean surfaces without damaging your machine, follow these steps:
- Select a Pressure Washer-Specific Detergent: Use only soaps explicitly labeled as "safe for pressure washers." These are formulated to be low-sudsing and pH-balanced to protect the pump.
- Use the Detergent Tank: Pour the approved concentrate into the onboard detergent tank. Do not inject chemicals directly into the water intake line.
- Adjust the Nozzle: Switch to the soap nozzle (usually the black one) to allow the machine to draw the detergent through the venturi system.
- Rinse Thoroughly: After applying the soap, switch back to a high-pressure rinse nozzle to clear the residue from the machine's internals.
If That Didn't Work
If you have a stubborn stain that requires a stronger agent like Simple Green or bleach, do not put it in the machine. Instead:
- Pre-treat Manually: Apply the cleaning agent to the surface using a handheld spray bottle or a garden sprayer.
- Dwell Time: Let the chemical sit on the surface for the recommended time (avoiding direct sunlight to prevent drying).
- Pressure Rinse: Use the Greenworks pressure washer with plain water to rinse the chemical away. This keeps the corrosive agents out of the pump entirely.
Heads Up
Always wear eye protection and gloves when using chemicals. Never mix bleach with ammonia-based cleaners, as this creates toxic gas. Ensure the machine is unplugged before performing any maintenance on the detergent tank.