Hi, Does it smell like ammonia?If so,it is the milk.Most of the time it will go away as it cures. When I soap with milk(s),I do cp.I freeze my milk flat in a baggie.I get all my my oils melted and ready to go,add my frozen milk to the lye.As soon as the lye is dissolved I add it to the oils. I do not insuate my molds. I have gotten the best resuts with this method.This wasn't my idea,I **think** it was Cyndi from Muller's Farm. HTH,