Throughout the history of modern lawn care, there's been a quest to find the perfect solution to prevent grass buildup under the mower deck. Caked-on clippings disrupt the airflow essential for lifting the grass for a clean, even cut and for discharging the clippings. Grass buildup also encourages rust and corrosion.
The tips that follow discourage grass buildup. Still, after each mowing, spray off any loose clippings that managed to cling to the deck. Connect a garden hose to the washout port and spin the blades while you run water through the port if your mower deck has that accessory installed. If it doesn’t you can easily add one using a kit. Or, you can wash off the bottom of the deck the old-fashioned way—by shutting off the mower and sticking a garden hose through the discharge chute to spray the deck.
Use a spray lubricant
Many people swear by using a spray lubricant such as MO-DECK to keep grass from sticking. These products can also help prevent rust and make cleaning the deck easier. Before applying, remove any accumulated clippings from the deck.
Mow only when it's dry
Grass is sticky when cut—there's no way around it. When you add water, cut grass can turn into a thick paste that's suitable as a building material. It may not always be convenient to wait until it's drier, but if you can spare the time to wait, do it.
Keep the clippings short
The shorter the grass clippings are, the easier it is for them to blow away from the mower. Cut no more than 1/3 the height of the grass. It's not only better for the mower deck—it's also healthier for the grass, because it leaves enough of the grass blade that the grass can keep on photosynthesizing.
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