I got some coyotes that got a lot of blood in coat. Selling to North American auction. And was wondering if I’m wasting my time trying to get it all out. Will it even matter for the auction?

Yes, the graders will probably knock it down a grade.
Give it the borax scrub. It's cheap and easy

You can wipe it with a cold damp cloth and get most of the blood out first. Then let it dry and clean with borax

This^^^

Borax


Rub it in-


Not bad, but let's do again-


Finished-


You can dry Squirrel tails with Borax-

Looks good! If you’re talking FHA when you say North American auction, they’ll tumble the fur before auction which will clean out some minor stuff, but I always brush out any blood with borax too. Like said above, spray down any fresh or dried blood right away. Fresh blood will come out pretty easily later on when it’s mixed with soapy water, the dried stuff is tougher.

You took the time to catch,skin,flesh and board the pelt. Why not finish the job and do an A1 put up!