Are you tired of trying to get the ground in dirt out of your shirt collars?
Try this tip: before washing those dress shirts pre-treat them with the favorite shampoo of the shirt's owner. Use about a quarter sized amount of shampoo and rub into the soiled collar or sleeves. Wait a few minutes and add the pre-treated shirt to the regular washer load. This works great on most 'ring around the collars'.
**Remember if the stain has been washed and dried many times before treated it may be heat set and might not come out. So begin treating the 'ring around the collar' when the shirt is new.