A 5-gallon bucket with Dawn and about a cap-full of bleach will kill everything. DO NOT let anything soak in anything that contains bleach....and rinse well. Hand-wash kills the critters. However, ALL fat and flesh MUST be removed. Remaining fat and flesh will ruin a hide/skin before bugs even bother it. Hap is spot-on....tumbling or blow drying is needed to properly care for afterwards. I ran a trap-line for 12 years and took many, many pelt to auction.