How do you make the goop mixture to take labels off?

I just use Goo Gone. Works best and is not expensive.

Or WD 40.

It is basically a penetrating oil, there is no "recipe". If you don't have Goo Gone, you can use WD40 in a pinch. It also does a nice job of removing dried paint from paint brushes.

I use really hot water, Dawn Dish & razor blade green scrubber sponge. straight rubbing alcohol works really well as does WD-40

THis might be what you are asking for

Mix about a tablespoon of dish soap, such as "Dawn", and a tablespoon of corn meal, or grits". Add just enough water to make it "useable". Exact proportions are not crucial.