Superior continues to test newer technology and equipment to find the most effective way to remove graffiti from any unpainted surface. We have developed the first completely propane fueled pressure washer with water recovery and recycling capabilities. We have also added the Farrow System which allows us to provide a low pressure environmentally friendly blasting alternative. Our pressure washing trucks are newer Ford F350 flatbeds equipped with HydroTec commercial pressure washers; 300 gallon water tanks and water recovery systems. All of our Pressure Washing Technicians have gone through NPDES training to meet state and local standards.
Pressure washing equipment uses water or water in combination with a solvent to remove graffiti from a surface. A solvent may first be applied and then the surface is washed with pressurized water. Sometimes a blasting media, such as baking soda; sand; or glass beading, is used to remove graffiti. While pressure washing is effective, it can wear down the surface being treated.
This refers to the intensity of the water stream. For conservation cleaning of delicate masonry, water pressure should be kept below 500 pounds per square inch (psi). General cleaning usually requires medium to high pressure (500-1500 psi).
This refers to the supply of water to the spray head, and determines the impact force of the spray just as much as the pressure rating. The greatest efficiency is likely to be achieved with water flow rates of between 3 to 4 gallons per minute.
Nozzle design determines the shape of the spray and has a strong bearing on the success of the cleaning process. A fan-type nozzle providing a spray fan angle of 15-50 degrees is considered best for graffiti removal and general surface cleaning. Larger angles reduce spray impact but increase area coverage, while a 0 degree pencil jet produces an intense impact harmful to soft or crumbly masonry and wood surfaces.
Heated water is useful for graffiti removal from metal surfaces where expansion of the metal helps break the bond. Heated water, however, if used in combination with solvents, may cause rapid evaporation of the solvents, reducing their graffiti removal effectiveness.