A box of hazmat liquids (drano, ammonia, bug spray, etc) leaked thru the cardboard box onto the concrete floor. It actually dissolved the top surface of the concrete. This is what it looks like, one $100 pressure washer later.
Pressure washers are cooooool! I used it to lift the black moss off the front stoop. You have to get just the right fan width in the spray, and the right distance from the ground. Then you can just slowly and evenly sweep back and forth to lift off all manner of surface contaminants. I love my pressure washer. The trick is to turn the hose on as far as it will go, so it can feed the motor.
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