Here is what I’m going to try for mycoremediation:

Litter that is made of compressed newspaper, wheat gluten, or finely powdered corncob debris will work, wheat and corn being the best because they clump, rather than just absorbing urine, which makes it easier to scoop out the soiled litter. Although pine-based litters are fairly incompatible with most cultivated fungi, newer fungal isolates (of Neolentinus lepideus) that will be suitable for use with pine are being developed and will likely be available in a few years. In general, the best species for remediating feline feces are king stropharia and oyster mushrooms.

Scoop the soiled litter into a bucket with a lid to prevent odors from escaping, and periodically cover it with clean, wet biodegradable litter that has been inoculated with fresh spawn. The mycelium will thread its way into the substrate, decomposing and deodorizing the soiled litter in as little as twelve weeks. Run this myceliated litter through a vermicomposting cycle next; don’t mix it into your regular garden compost until it has been thoroughly decomposed by the worms.

It’s been one of my favorite books since high school in the 90s.

Yep, to control odor!

A lot of it washes off with the soap. I’'ll let you know once it’s dry and I can test it.

Me too! I hope it works, but if not I have some other ideas for biodegradable litter.

Yes, pretty much everything is recycled / reused in the indigenous village that I live in. I bought a big roll of unsold old newspapers for less than $1 and used only a small part for the first batch. They sell them in most of the tiendas to wrap stuff up with. If I were still in the US, I would just go to a county recycle bin and get a big pile for free.

lol. Try it and see!