The next time you're at the store, pick up an extra paper towel holder. When you get home, install it in the front section of your garage and insert a roll of towels. The towels will be accessible and handy for checking the oil in your vehicles and other quick clean-ups. The holder will also help you avoid fumbling with loose rolls or searching out rags.
If you plan to refurbish a major shop tool or other equipment, take some photos before you start. They possibly can save you some head-scratching during the reassembly process. Take pictures from a number of angles, and take close-ups of areas where you think you might have some questions later. The more complex the machine, the more photos you should take.