I typically use the same method to clean wood bowls as I do wood stems. I remove the screen and soak it in iso. Then I slather the whole bowl with wax (usually a combination of beeswax and mineral oil, but there are lots of good options). I leave it alone for an hour or so and then wipe off the wax. Resin is fat soluble and it usually just gets pulled right into the wax. The bowls always come out as good as new.
My favorite wood bowls right now are made by DFreez Designs:
https://www.dfreezdesigns.com/s/shop The One bowl is great with most of my 18mm injectors. I think it is their best bowl. The Couchlog bowl is good with the CouchLog, great with the Underdog Alpha.
The Ed's TNT injector bowl is great although I don't have the most current version. The injector has to be held in place but it has a good seal despite resting only on the lip of the bowl. It also works pretty well with 14mm injectors if you drop the metal CL herb chamber in it.