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Page 30
OPERATION TIPS
Terms
Preparation
Pressure Washing
• PSI - Pounds per square inch (PSI) is the unit to measure the pressure of water. In relation
to a pressure washer, the higher the PSI number, the greater the pressure and stripping
power produced.
• GPM - Gallons per minute (GPM) is the ow rate of water. In relation to a pressure washer,
the greater the GPM, the greater the ow or rinsing power produced.
• CU - Cleaning units express the eciency of the pressure washer. Cleaning units are
calculated by multiply the PSI by the GPM. The higher the CU, the more ecient the
pressure washer.
• Read all warning and instructions in this and all manuals that came with the pressure washer.
• Remove all toys, bikes, lawn furniture, etc. from the work area if they are not to be cleaned.
• Sweep any loose dirt and debris from the surface you will be pressure washing.
• Cover nearby plants to avoid damaging them with the pressure washer spray.
• Use caution when spraying windows. Always use the white, 40
o
nozzle and stay at least 4 feet away.
• Lay tarps down to collect paint chips and other debris blown o by the spray. Exterior paints
used before 1977 may contain lead and will produce chips that will need to be collected and
disposed of at a hazardous waste facility.
• A wider spray equals faster cleaning, while a tighter spray equals deeper cleaning.
• Keep the nozzle about 4 feet away from siding to avoid damage.
• Start washing siding at the bottom and work your way up, then rinse from the top down.
• Avoid driving water up behind siding.
• Use overlapping strokes for even cleaning.
• Work in small areas to keep the soap from drying.
• Do not aim the nozzle straight at the surface. Hold the wand at a 45
o
angle to the surface at a distance
that cleans well without causing damage.
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