28. What is hooch? Refrigerator hooch? What do I do with it?

Hooch and refrigerator hooch are the same thing.

When the starter goes quiet (this tends to happen faster in the
refrigerator, whence 'refrigerator hooch') the mixture separates. You
have a layer of flour with miscellaneous yeast and bacteria and a
layer of water with a touch of alcohol (whence 'hooch') and other
fermentation byproducts.

You mix the hooch in with the layer of flour when you feed your
starter otherwise you will change the water:flour ratio of your
starter.

A better way, in my opinion, to restart an old hooch layered starter
is to use a tablespoonful of the old starter to get another flour and
water mixture going as a new starter. You can get a healthier starter
faster that way.

-Darrell