Experts and BHG readers answer.
Don't use any kind of vinegar solution--no matter how diluted--if there are plants in the pot. It will burn the roots. Take the potted plant to the sink and flush it with water while scrubbing at the mineral deposits with a toothbrush. The minerals were once in solution because they got onto the pot's rim through watering. By scrubbing with a brush and flushing with water, you're working to get them to dissolve into the water again and flush through the pot.