1.How to clean the spark plug 1.Using the brush, wipe off mud and other dirt on the surface of the spark plug. 2.Clean up the spark plug with the wire brush. This is the best method for cleaning off mud and other dirt on the surface of the spark plug. 2.How to clean the chainsaw bar Sharpen the chain by hand to maintain the sharpness. Clean the bar regularly with the wire brush to remove waste, which can affect the engine performance. Clean the bar with the wire brush to remove waste regularly. Clean the bar regularly to remove waste. 3.How to clean the muffler 1.How to clean the muffler 1.Turn off the engine and disconnect the spark plug before cleaning the muffler. 2.Cleaning with the wire brush Clean out the dirt with the wire brush.