I spent most of this past year helping a friend to clean out his dad's farm/barn/house/etcetera to get it ready to sell. The owner turned 99 this past month, and hasn't lived in the place for several years. I managed to save quite a few old tools from the metal scrap bin, and have cleaned most of them up with a wire wheel. The PSA? If you plan to use a wire wheel to clean rust, WEAR A GOOD DUST MASK! My shop is in the basement of our house, which is heated by a propane-fired forced-air furnace. The picture shows two air filters, the one on the left was changed just before I started wire-brushing, while the one on the right was changed after several hours of rust removal. I started wearing a mask once I saw that second filter!