If you only use your WD-40 once in a blue moon though, you’re missing out on this super product’s full potential. Credit: WD-40 CompanyWhy Is It Called WD-40? It will also work to prevent rusting, but don’t worry, WD-40 won’t damage your plants if used on the tools. Coat any poles as well as the top of bird feeders with WD-40 so that squirrels will slide right off. Protect Your Lawn MowerA coating of WD-40 will protect your lawn mower parts from rusting and corrosion.