I cut down a few invasive trees recently (Norway Maples). If you inoculate the branches and logs with spores of a mushroom that you want (in my case, shiitake) during the first few weeks after cutting, it will fruit with that for a few years. It's a fun DIY project, and a way to reuse trees.
To prevent unwanted mushrooms from the environment from colonizing, you seal the holes you drill, as well as the end the ends of the logs, with cheese wax - which I had heated in a crock pot, hence the need for cleaning that up.
TIL, thanks!
See the boiling water brother comment.
They're now stocked in most of the big chain supermarkets, but it's a "reformulated" version of Bar Keepers Friend using Citric acid instead.
It's completely and utterly useless at cleaning the things the old Oxalic acid version worked on. :(
With careful perusal and emailing via Ebay though, the original formula stuff can be found.
This is the seller I get it from: https://www.ebay.com.au/itm/231989692018.
I'm not affiliated with them in any way.
The benefit of using oxalic acid for cleaning, apparently, was discovered as part of the process of cooking rhubarb:
Word to the wise: go to the thrift store and pick up some old pots and spoons before attempting this.