I’ve looked into this as I had a phase where I wanted to bequeath my various bones to my friends, family, and enemies after my death.

The best way to clean a skeleton is with dermestid beetles. They are most commonly used at natural history museums for preparing animal bones, but I couldn’t find any that would work with humans. Your best bet is to find a private entity with experience in preparing bodies for scientific study. Alternatively, you could source the beetles yourself - this would likely take longer as you need quite a few, so storage will be a concern, but you wouldn’t need to worry about transport which has more legal considerations. Once the beetles have done their work, the bones themselves keep quite well if stored properly - no different than animal bones.

Unfortunately the whole processes seemed cost prohibitive so I’ll probably just ask to be dumped in a forest somewhere