Removing Yellow Bleach stain from laminate counter
It took the blue stain right off. However left a much larger yellow one.


So the bleach yellowed the counter. Bleach is an oxidixer, so you'll need a reducing agent to reverse its effect. Dithionite is a good choice, and is sold in stores as "Iron out" or "Super Iron Out". Lacking that, anything that smells vaguely like sulfur, or ammonia-like even is worth a try. Ordinary surfactant based cleaning agents aren't likely to help you here.