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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.
What else can I help you with?
Will parking on concrete and grass kill car battery?
No
How can I lay artificial grass on concrete?
To lay artificial grass on concrete, you will need to clean the concrete surface thoroughly, apply a layer of adhesive or turf tape, and then roll out the artificial grass on top. Secure the edges with nails or adhesive, and brush the grass fibers to make it look natural.
Can grass grow on concrete surfaces?
Grass typically cannot grow on concrete surfaces because concrete is not a suitable environment for grass to take root and grow.
Does painting grass kill it?
No, painting grass does not kill it.
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.
Can you put grass over concrete to create a green space in a paved area?
Yes, you can put grass over concrete to create a green space in a paved area by using artificial turf or installing a grass grid system that allows grass to grow through the concrete.
Can boiling water permanently kill grass?
Boiling water can kill grass temporarily, but it may not permanently kill it as the grass roots can regenerate.
Will a soccerball go farther in concrete or grass?
A soccer ball will typically travel farther on grass than on concrete. Grass provides a softer and more cushioned surface, allowing the ball to bounce and roll more easily compared to the harder and less forgiving surface of concrete.
Does cat feces and urine kill your grass?
Yes, cat feces and urine can harm your grass due to the high nitrogen content in cat urine that can burn the grass. The feces can also contain harmful bacteria that can negatively affect the grass. It's best to clean up after your cat promptly to prevent damage to your lawn.
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 you grow grass over concrete?
Yes, it is possible to grow grass over concrete by using techniques such as laying down topsoil, planting grass seeds, and providing regular watering and maintenance.
