Call me cheap, or....well....just call me cheap! I wire brush the underside of all three of my decks in the spring then liberally brush on new bar and chain oil. I let it sit for a few days before the first mowing, then wash the underside of the deck with a garden hose after each mowing (with the deck on the tractor and the blades spinning to create more turbulence). I've found I only need to repeat this "treatment" a couple times during the season and then before I put them up for the fall. Cheap, effective and really not that time consuming!
Duff :thumbs: