“Bio-enzyme” - real or woo?

It’s almost certain that bread yeast (what is being used here I assume) is going to have a pretty limited set of enzymes- probably amylases to convert the starch in flour into sugar for the yeast’s own use, and possibly some proteases. The orange peels aren’t likely to be significant sources of enzymes I wouldn’t expect.

But the kicker is that enzymes tend to work best in certain temperature bands, and they aren’t necessarily instantaneous. So even if somehow you managed to get enough amylase out of your yeast fermentation to do something, there’s a good chance your countertop is going to be the wrong temperature, and you’re unlikely to leave it on there long enough.

Yeah, but your saliva already contains two types of amylase. Similarly, your body makes the enzymes it needs. A few require certain things in your diet. But if there was something really needed that was missing, you’d have run into trouble long ago. Such a problem is not going to be cured by a rag and a bone and a hank of hair.

… just leave your bench top to “improve” for a couple of hours, punch it down, leave it another hour, then wipe the cleaner off …