Pinned over 24,000 times, this cleaning trick is one to keep handy. All you need: distilled white vinegar, paper towels, a spray bottle, and an old toothbrush for scrubbing. Lay paper towels soaked in vinegar along the shower door tracks, and leave them there for 30 minutes. When the time's up, the grime should easily come off with a toothbrush. For tight spots, use a Q-tip.