I get in the mood to home tan, or my wife makes a special request for fur to use in one of her craft projects. I've had good luck with small, thin skins like marten, and even with deer, wolf and spring bear. Heavy hides like moose, 5/8 inch thick or more at the shoulder, and greasy hides like fall black bear have flat defeated me. Five dogs took my last moose hide down from the shed wall where I had nailed it between applications of fifteen or twenty pounds of Dixie Tan. The dogs dragged the hide into the woods and ate every bit of it, not even getting indigestion from the seasoning. The last fall bear hide I ruined was so greasy that even though I worked it for probably hundreds of hours, using everything from detergent, to tanin, to tanning chemicals, and refusing to soak it in gasoline, as one elder recommended, that hide just kept oozing out grease. After all of that, the pieces that didn't get carried off by the ladies to be set aside for use in that dream project, and there to mildew, stayed green. And I was not 'being green' by using supposedly safe chemicals. I truly wanted a cured hide. I don't want to soak up my place with toxic fluids, but I do want something that soaks into thick hide and that cuts the grease.
As you can see, this is a cry in the wilderness for suggestions, and they will be much appreciated.