My GSD gave birth to 11 puppies a week ago. All are healthy and gaining weight. I noticed some hard patches on the puppies bodies. The vet checked and said it was milk and needs to be removed so to wash the area with 'hibiscrub' until it comes off. It's not really coming off and I'm worried about infection from the bacteria in the milk causing hotspots. Please has anyone experienced this and any ideas on how to get it off?