Tips For Cleaning Your Lawn Mower’s Undercarriage. A lawnmower won’t mow your lawn effectively if it isn’t maintained and a very important part of maintenance is cleaning. There are a lot of things that can build up in the undercarriage of the mower – things like grass clippings and other forms of debris. We’re going to show you the things you need to do, to clean underneath the bottom of your lawn mower. First, before you start working on your lawn mower, you should disconnect the wire from the spark plug. You usually need to tug the wire that connects to the spark plug and it should come out, hassle-free. Do this so that you can stop the mower’s engine from accidentally engaging and possibly injuring you.. Remove the bolts that hold the lawn mower blade in place by using a socket wrench. Use heavy work gloves to hold the blade, otherwise, try not to touch the sharp edges of the blade so that you don’t get cut.. Spread a tarp and place the lawn mower on it, tilting it sideways, with the air filter side up. You can do an oil change while you’re at it.. Use a wire brush to scrub the undercarriage of the lawn mower and to remove the dried grass and debris from it. If you have a buildup of grass under your mower, it can stop the blades from cutting properly.. Use a water hose with a spray nozzle to spray the underside of a spray nozzle to get rid of the debris that’s left on the mower’s deck. Let the mower dry completely.. Finally, reinstall the mower blade, refill the engine with new oil and then reconnect the wire to the spark plug. If you are looking for small engine repair services in Ottawa, mobile car battery boosting, lawn mower and lawn tractor repairs and tune-ups, or snow blower repairs then give us a call to book your mobile small engine repair today. We fix, repair, and tune-up small engines such as lawn mowers and snow blowers. The best part is that we come to you so no more waiting in line or traveling back and forth to fix your small engine equipment.