Removing freelance artwork and remarks from a municipalities public concrete surfaces is a never-ending process. The best option for this type of surface is to power-wash the graffiti with a 3000psi-pressure washer. Be careful in selecting the type of tip you use in the pressure wand. Too narrow of a tip (such as 0 degree) will etch the masonry surface leaving a perfect outline of the graffiti removed, which only creates another eyesore.
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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