Tell us about yourself!
When I was making muzzle loaders, I used Potassium Permanganate as wood stain. start with a weak sol. 0.5% in water. More applications make darker, or stronger sol. 5% will give a dark grey to black.
I have used spit to remove blood stains for years, works great, but people do look at you sort of funny sometimes. !!!
You might try peroxide along with clean dry pine sawdust, then vacuum. !!
How about Aloe Vera?