What is the best way to preserve fabric color when washing?

To avoid discoloration of fabrics, it helps to be aware of the following: • Undiluted liquid fabric softener can cause greasy stains. Rub any such stains with bar soap and then rewash the garment. Be sure to follow the instructions in your washer’s owner's guide for using fabric softener. • Graying or yellowing of fabric may result from using an inadequate amount of detergent, wash water temperature that is too low, or wash time that is too short. • Sort loads according to soil level. Use the recommended amount of detergent and the hottest water safe for the fabric. • To whiten or brighten items, use chlorine or nonchlorine bleach (if safe for the fabric) or a water conditioner. • Yellow or brown rust stains can be caused by iron or manganese in your water supply or in your water pipes or water heater, as well as by metal fasteners on items in the load. Flush rusty water from pipes by running water into a nearby sink for a few minutes before starting the washer. Drain your water ...  more