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A pressure washer will definitely kill grass if you don't control where the nozzle is aimed. Otherwise, it will do an excellent job of cleaning concrete with tap water.
If you need to get a little more aggressive to remove oil and grease spots, try scrubbing the spots with trisodium phosphate (TSP) which is available at most hardware stores. A little TSP goes a long way and the worst it will do to the grass is to make it grow faster because it supplies phosphate, a plant nutrient. Excess fertilizer will, of course 'burn out' grass but you won't likely be using anywhere near that much TSP where you need to worry about that problem. Follow the instructions on the container. TSP strips the oils from your skin and causes instant dishwater hands so wear gloves and eye protection.
There are other surfactants like "Clean & Simple" (from the link below) that you can use, too. I use Clean & Simple to wash everything from windows to the dog...it de-stinks the dog and kills the fleas. It is non-toxic--being a good surfactant, it simply breaks the surface tension of the water and drowns 'em.
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∙ 11y ago
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Will parking on concrete and grass kill car battery?
No
Will a soccerball go farther in concrete or grass?
Concrete. Grass will have more friction, and will slow down the ball.
What creates more friction, concrete or grass?
Grass. This is because carpet (grass or soil) has more friction than a smooth surface like tile (concrete).
Does grass kill plants?
There is certain types of grass that kill plants, but normal yard grass will not, it also depends on the plants. But usually its the weeds that kill the plants, not the grass.
Why don't you go as fast on the grass as you do on concrete on a scooter?
The grass has more friction than the concrete, so the scooter doesn't go as fast
Can a blade of grass kill you in a tornado?
A blade of grass cannot kill you, even in a tornado, but the tornado can kill you.
How do you clean human blood on concrete floor?
For sanitary reasons, a 10% bleach solution should be used. This will clean the stain, as well as be potent enough to kill viruses that may be carried in blood, such as HIV.
Is a volleyball net better on concrete or grass?
Doesn't really matter but if u put it on grass, diving isn't an issue. On concrete however it may hurt
How do you clean your concrete floor?
the best way to clean you concrete floors is with hot and soapy water and lots of hard work
How do I kill grass growing around my perrienels?
An herbicide that is specially designed to kill grass will kill the grass growing around your perennials. Be sure to read the label carefully to ensure that it is for grass and will not harm your other plants.
Does cat feces and urine kill your grass?
Yes, the acid from the cat urine will kill grass.
Will you kill the grass when you drain the pool?
yes because the chemcials will kill the grass or at least discolor it.
