I let everything sit till early summer(after bear) then boil them, do 7-10 a year never had issue.... i do boil them several times over couple days so that i keep changing water. Use 20 mule team whatever and dawn dish soap. Once boiled clean 40% peroxide and whitener power mixed into a paste and applied with a brush, sit in sun do that for couple days with rising off previous days with hose and applying new coat turns out great. Got many euros some for many years now never had a weakness problem, just use big enough pot(sq galvanived feed pot/turkey fryer) occasional nose bone works loose and obviously elk ivorys fall out just pick them out when u dump pot, little glue in finished product. My pots usually have 1 elk and 2 deer in them at a time, occasional wire brushing or scraping with a puddy knife or chisel helps speed things up. I have a euro tool box full of brushes of all sizes and scrapers i use cause they are nasty. I dont understand the boil ruins them arguement but works for me so going to keep doing it and best of all pretty cheap and fast. My spring bear this year was finished in 10 days from when i shot it and looks amazing!