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It may be tempting to spray the chemical cleaner on high pressure, but doing so won't get you anywhere faster. When power washing, you should always apply the detergent on low pressure for two reasons. First, if you tried to spray the detergent on high pressure, the force and speed would simply make the solution splash off, resulting in a waste of your time. Second, chemical injectors do not typically work in high-pressure mode, but will switch from low pressure to high pressure from the wand. This transition makes the process smoother for you, so that you can go straight from applying the detergent to rinsing it off.