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Here's a pic showing the soot being cleaned from Carnegie Library - pretty black indeed. I kinda remember those days. https://www.reddit.com/r/powerwashingpor

by Isamu 8y ago

Here's a pic showing the soot being cleaned from Carnegie Library - pretty black indeed. I kinda remember those days. https://www.reddit.com/r/powerwashingporn/comments/6ev3pe/carnegie_library_being_sand_blasted_in_1990/ https://www.reddit.com/r/powerwashingporn/comments/6ev3pe/ca... They say "sand blasted" but I'm pretty sure they used gentler methods.

milesokeefe 8y ago
Some power washers integrate sand into the water stream. So sandblasted, but by a high pressure jet of water carrying sand instead of air blasted sand.