One great way to remove graffiti is to sandblast it with a pressure washer and baking soda. This technique can be very effective for graffiti removal if used with a hot water pressure, though cold water can be used as well. There's one word of caution, though. If you're using this technique around landscaping, be sure you have adequate drainage that allows you to avoid the grassy areas or any other plant life. Water runoff containing baking soda changes the pH balance in soil and this can ruin any vegetative growth on top of the soil. Also check your local laws regarding retaining pools to see that toxic materials like lead based paint don't get into storm drains or seep into the ground water.
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Need a little more scrubbing power? Want to increase your cleaning efficiency?
Ultimate Washer offers a variety of Rotary Nozzles from which you can choose. Your cleaning time can be cut in half with the addition of this nozzle. These nozzles rotate at high speeds to increase the intensity of the spray. They can remove rust, graffiti, and barnacles from the bottom of boats just to mention a few. They can be used on pressure washers with as little as 3000 PSI up to the super heavy duty pressure washers whose PSI reaches 5000 PSI. Find more info at http://www.ultimatewasher.com/pressure-washer-rotary-nozzles.htm