That dark brown stain from you Diet Coke looks like it will be difficult to remove. This is a guide about removing Diet Coke Stains from clothing.
I spilled Diet Coke on an all cotton shirt. I have used Stain Out on it and washed it about 6 times, every time I have clothing the same color, using the Stain Out each time. I also called the Coke company and they couldn't help me. Any suggestions for removing Diet coke stains from a 100%cotton shirt?
Thanks in advance,
I've had good luck with shampoo and dish soap before - pour and let it sit for a bit, and then wash.
I've also had some luck with a Tide pen with some older DC stains - you might want to give that a shot.