If your beautiful green lawn takes on a white cast the day after you mow it, then we’ve got a tip that will put a smile on your face – for sure! The white cats is nothing more than your lawn’s torn blade-tips drying out and losing their color. A lawn mower blade that is dull tears the grass instead of cutting it. Sharpen your lawn mower blade with a simple hand file and an oil stone. Th sharper the blade is the greener and more even your lawn with be when you’re finished. By the way, with rotary mowers, make sure that you don’t bend the blade while you are trying to sharpen it. If the two cutting surfaces are out of alignment with each other tearing may result – even if you’ve done a super job of sharpening.