When you reuse your plastic flower pots year after year, over time they will often develop a calcium buildup on the surfaces of the containers. Because this calcium buildup is unsightly, many gardeners want to remove the buildup on plastic flower pots to restore them to a like-new condition. If you use a simple vinegar soak and then scrub at the buildup areas with a scouring pad, you can remove calcium buildup easily.
Fill the bucket or sink with a combination of half white vinegar and half cool water. Mix the liquids around to completely incorporate them.
Place the plastic pots into the bucket or sink so they are completely beneath the liquid. Keep the plastic flower pots in the diluted vinegar for approximately eight hours.
Remove the plastic flower pots from the vinegar and use the scouring pad to scrub at the areas that had the calcium buildup. The buildup should wipe off easily as you rub it because it has been soaking in the vinegar.
Dip a damp toothbrush in baking soda and use this to scrub at any stubborn calcium buildup that you cannot remove with the scouring pad.
Rinse the plastic flower pots in cool water to remove all vinegar and baking soda. Allow the flower pots to air dry.