I am older and never knew this.
You know how you spill bleach on yourself and with 30 min...you see, "Oh no..." ?
Well, I have canvas pillows outside...one is white and got black mold in the fibers...
I soaked it in bleachy water for a few hours...nothing.
Did it again for 24-36 hours, tho...VOILA! Like new.
I thought this group would like this story.