No problem using bacon grease. All you need to do is collect a batch from a the kitchen, put it in a coffee can, and add water. Put it on the stove and bring it to a boil. Let it go for a while, then take it off to cool. When cool, stick it in the freezer. Next day, punch a hole through the hardened greeas (which has dutifully worked its way to the top), pour off the water, and scoop out the nice, clean, salt free grease. The water has dissolved out all the salt, and most of the smell. It will quickly revert to normal consistency at room temperature. Use as is or mix with bees wax and you have just made true the old adage "waste not, want not!