There are three ways to do euros. You can rot it off in a bucket of water (maceration), simmer it off, or use beetles. Beetles and rotting smell bad. Simmering off the meat smells the best, but is the least effective. Too hard to get all the meat out of the sinuses using that method.
Rotting and beetles should be followed by brief simmer in a soapy solution regardless. It helps to remove odors and degreases the skull.
All should be left in the sun for at least a day after whitening with peroxide. It airs them out and really turns them white.
