Use maceration to remove the dried on soft tissue. Do this by putting them in a bucket of warm water heated to around 90 degrees, Submersible salt water aquarium heater tops out at 93 degrees and works fine for this. Fresh ones take a week or so to dissolve the soft tissue. Dried on soft tissue may take a little longer. There will be some odor so do outside. I cover the bucket with a trash can with weight on it to keep the odor inside and critter out of it. Check them about 10 days later and if the soft tissue is gone, rinse them with a hose and wash the bucket out.
Put them back in the bucket with the heater and a couple ounces of Dawn dishwash liquid. This will kill the stink and remove grease. Run about a week and change the water/soap and repeat for another week. Rinse well and let dry thoroughly. If some of them look shiny on the surface, you may need another round or two of the soap soak and let them dry again.
Next, soak them in Hydrogen Peroxide. The drug store brown bottle will work but takes longer. 40 Volume from a beauty supply place is 4X as strong as the drug store brown bottle and works faster. The peroxide disinfects and whitens the bone. DO NOT use chlorine bleach as it damages the bone.
Life Member: NCTA, VTA, NTA, TTFHA, MFTI
Member: FTA
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