How can I take out dog diarrhea stain from unfinished pine floor?
Unfinished wood is tough because the nasties in the diarrhea have soaked into the wood fibers. to get the stain out you might end up bleaching the wood. I would try a weak hydrogen peroxide and water solution. Peroxide may take some of the color out but I think it would be less harmful than bleach and water. The products that take pet stains out of carpet probably won't work in this case. Another possibility is a real steam cleaner, my wife has a lady bug steam cleaner and it is amazing how well it works, a steam iron with a damp towel may work similarly. I think any stronger cleaners like trisodium phosphate will also bleach the coloring, since the floor was unfinished the stain might be fairly deep so I would try hydrogen peroxide 3% to water or steam cleaning prior to anything stronger.