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The ideal PSI (pounds per square inch) for a pressure washer depends on the surface you are cleaning. For general home use, a pressure washer with a range of 2,000 to 3,000 PSI is recommended and powerful enough for most residential projects.

The specific PSI you should use varies by task:

• High-Pressure Tasks (2,500-3,000 PSI): Tough materials like concrete, stone, masonry, and brick can handle higher pressures. This is suitable for removing stubborn stains from driveways or cleaning graffiti.

• Low-Pressure Tasks (around 600-1,300 PSI): Softer surfaces require a gentler touch to avoid damage. Use a low PSI setting for cleaning wood decks (especially softwoods like pine and cedar), vinyl siding, outdoor furniture, and stucco.

For best results, choose the right nozzle for your surface, such as a 15-degree nozzle for siding or a surface cleaner attachment for driveways. Using an extendable wand can also make the work easier and more ergonomic.

There’s no legal requirement that states that you need rebar in a concrete driveway, but since the slab will be supporting heavy vehicle loads, it’s always a good idea to pay a bit more for rebar reinforcement. Your driveway will be much more likely to crack if you don’t reinforce it with rebar. Driveways that need to support commercial vehicles or provide parking for multiple vehicles at once should always include rebar reinforcement. If you’re pouring concrete over asphalt or pouring concrete over an existing slab, you may not have enough depth for rebar, meaning an increased risk of cracking.

Combining power and soft washing is a great way to ensure that all surfaces, both fragile and not, get the attention they deserve. Start by power or pressure washing durable materials like vinyl siding and concrete pavement or driveways, then switch the tips on your machine and finish up by soft washing the more delicate elements, like shutters and front doors, for example. 

Combined with a cleaning agent, pressure washers and power washers are highly effective at removing driveway stains. However, these machines are not gentle, putting your driveway at risk of damage. Instead of renting a power washer yourself, ask a professional pressure washer for a consultation.