RE: How much salt??
The only thing I have ever used Borax for is a 50/50 mix with dp for birds. Sorry but I try not to experiment with things I haven't heard about. I use salt for it's ablilty to draw out bodily fluids and moisture. I haven't heard of Borateen. If you are interested, try one on an animal and let us know. I wouldn't use it on anything that I wanted to mount or means something to me or someone else.