Dishwashing liquid does not help grass grow. This is an urban myth. Dish soap contains surfactants which will dry out and kill grass.

Does soapy water kill grass?

Dish wash soap can cause damage to your plants and grass, but can also be used as a safe pesticide with less impact on your yard. ... Fill a spray bottle or garden sprayer with the mixture, and spray the areas of your lawn that are affected with pests and weeds.

Can bubbles kill grass?

Yes, lawn bubbles can kill your grass. This happens because the water layer beneath the surface deprives the plants of nutrients. ... If this pocket of water isn't drained, the grass won't be able to reach its roots into the soil again to draw up the nutrients it needs to thrive.