Shellac is made from an excretion of the female lac beetle, not from any of its parts (though parts may end up in shellac through processing - something to keep in mind if you are vegan...). The different forms of shellac - amber, orange, blonde, etc. are a result of different levels of refinement. Dewaxed shellac is better than waxy shellac for adhesion of top coats, especially water-based finishes.
Fitz, to clean up, just use alcohol. The cheap kind is fine, save your best sipping whiskey for assembly.... Denatured alcohol is the usual solvent, but you can use grain alcohol as well (many guitar builders do this).
Cheers,
Dan