Step 1
Fill a plastic tub with a 50/50 solution of water and white vinegar. Use enough to keep the glasses submerged.
Step 2
Place the plastic cups into the basin, letting the cups fill with the solution and fall to the bottom of the basin. Let the cups soak for an hour.
Step 3
Remove the cups and scrub with a nylon scrubbing pad.
Step 4
Rinse the glasses with clear water and dry with a cleaning rag.