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Going under Sidewalks with Pressure Washer
How do you use a pressure washer to go underneath sidewalks?
Just dig a start hole, point and shoot. A regular garden hose does a decent job.
I just used a pipe from Home Depot and whacked it underneath the sidewalk with a hammer. Worked great, didn't make a mess, and didn't wash the sand out from underneath the sidewalk which can lead to cracks in the concrete later.