Take 30 seconds a day to keep shovels, spades, trowels, and hoes clean and rust-free. Fill a 5-gallon bucket with sand, and place it near the entrance of your toolshed. Mix in about 2/3 of a quart of motor oil -- enough to dampen the sand, but not to soak it through. Whenever you return a tool to the shed, knock off the biggest chunks of soil, then plunge the tool's head into the sand a few times. Brush off the sand, and store the tool as you normally would.
Martha Stewart Living, October 1997