https://www.amazon.com/Mrs-Stewarts-Bluing-1101-MPLS-8oz/dp/B001NEMV3Q/

If you used bleach and they are still yellow, add a bluing agent. Blue is the opposite side of yellow in the color wheel and it would bring back to white

https://www.amazon.com/Mrs-Stewarts-Bluing-1101-MPLS-8oz/dp/B001NEMV3Q/ref=asc_df_B001NEMV3Q/?tag=hyprod-20&linkCode=df0&hvadid=309832782859&hvpos=&hvnetw=g&hvrand=61669910217602829&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9016952&hvtargid=pla-424802797391&psc=1&tag=&ref=&adgrpid=70155173188&hvpone=&hvptwo=&hvadid=309832782859&hvpos=&hvnetw=g&hvrand=61669910217602829&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9016952&hvtargid=pla-424802797391