HOW DO I REMOVE STAINS CAUSED BY DISCOLORED WATER?

In laundry, soak for 15 minutes in solution prepared in proportion of one ounce oxalic acid crystals per gallon of water. Rinse thoroughly with clear water.For sinks and tubs, etc., run sufficient hot water to cover stains. Add two ounces oxalic acid crystals, and swish until dissolved. After allowing to stand 10 minutes, drain and flush thoroughly with clean water.Use “Iron Out”, available at local stores.