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Yes, pressure washers can remove rust stains from concrete. However, when coupled with an acid treatment, they can be even more effective. Just be sure to use a minimum of a 15-degree nozzle to prevent damage to the surface, and users must also be careful not to get in the way of the pressure washer’s jet as they can cut through skin and cause injury. 

Yes, you can remove oil stains from your driveway by applying an absorbent material such as baking soda, sawdust, or cat litter, pouring on a liquid detergent such as dish soap, scrubbing the area, and rinsing with water. You can also use a diluted bleach solution, white vinegar, or TSP solution on concrete.

Whether you need to winterize your pressure washer depends on where it will be stored. If it's kept in a location where temperatures could drop to freezing, any liquid left in the water pump can freeze, expand, and cause severe damage to the machine. To prevent this, you can add antifreeze to the pump. While emptying the machine with compressed air is an alternative, it can be a tedious process and may not remove all the liquid. If you can store the pressure washer in a relatively warm place with no risk of freezing, you won't need to add antifreeze. However, regardless of storage conditions, it is good practice to empty the gas chamber and refresh the oil before storing it for the winter.

You should wait until your pavers have completely dried and cured before pressure washing them. Wait at least three to five days, though some sealants may need up to an entire week. Rushing that timeline can mess with the finish, weaken the seal, or leave streaks that are tough to fix. Once the sealant has fully set, stick to a gentle approach. Keep the pressure under 1,500 PSI and hold the nozzle at least two feet from the surface. Anything stronger or closer can blast the joint sand loose or wear down the sealant you just applied.