If you drive much in the cold winter, you know what it’s like with windshield wipers collecting ice and getting heavier and heavier. Then you get to stick your head out the window and reach around and grab the wiper and flick it to get some ice off.

Used machinery has more value than ever in the marketplace. But that doesn’t mean every deal is a good one. Here’s a great new way to figure out if you’re getting a deal.