In the time since you last cleaned it, the garage is likely to have accumulated a whole head of junk. To regain control of the space, you've got to conquer the clutter first. Start by removing everything—yes, everything—and in the process, set items into three distinct categories. In one group are the tools and supplies to which you need regular access. In another, the seasonal items you only use a few months per year. Most importantly, designate a pile for discard or donation.