Really pay attention to the part where you're told not to leave the chemicals on
concrete until they dry ;->
I used one of the spinning rotary nozzles the last time I did my sidewalk.
I rented one of the really powerful units to do my walks, which were all full
of algae & were slippery when wet. The results were so dramatic that I'd doubt
I'll go six months between rentals anymore.
Clorox is chlorine and very high PPM of chlorine. Chlorine is not really
dangerous to concrete but it leaves a white film on it if you don't get it all
out. Believe it or not a good all purpose cleaner of anykind cuts the grease
fairly good and is cheap to use and safe. Wear safety goggles!
work safe, candice
Depending on why you're pressure washing, a light bleach solution is
often used to kill algae and mildew. There are commercial cleaners
available, check your local hardware store or Lowe's/Home Depot.
I've pressure washed dirty concrete paving and also dirty asbestos
roof sheets. The pressure washing does remove a thin film of concrete
or asbestos in my experience. Not a lot is removed probably, I just
wouldn't do it too frequently. The wear finish surface for concrete is
often quite thin and you might abrade it all away with the high
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