I found this site so useful and decided to try some of the tips and use my own variation. I had some white clothes that I loved that had yellow stains, my t-shirts and underwear. I boiled them in Zud for 20 minutes, let them sit and then I boiled them in Oxiclean for 10 minutes and let them sit for 2 hours and rinsed them. They came out pure white. Thank you, hope this helps others take care of their stained whites.
By Mike from NYC