Collar ring stains is one of the major problems for many of the dress shirt wearers. Collar ring stains are created due to body oil or hair oil accumulation around the neck. If you do a full white-collar job then it is less likely for you to get collar ring stains everyday. However, for people doing some physical work or fond of using hair oil or hair creams might get collar ring stains daily. Like for other stains, try to remove it as soon as possible. Washing shirts without first treating collar rings will make the collar stains harder to remove.
Before washing the shirt, it important to treat the collar ring stains first. Mostly collar stains are oil based, so using shampoo, dishwashing detergent or oil-removing products would be ideal. Wet the affected place and apply the removing product on it. Either rub the stain gently with toothbrush, with collar itself or if you fear color faint then rub it with your finger. Then soak the collar in warm water for 15 to 20 minutes; if stain persists, repeat the process again. After treating the stain, proceed with washing the shirt.