Looking for suggestions. This litter had been the cleanest I have ever had, they are 12 days old not. For the last 3 or 4 they have become very sticky and hard to the touch if you get my drift, despite my girl washing them all the time. I have tried special pet wipes which have proved useless and obviously aware of not using harmful chemicals but don't recall this problem before and I have done everything from hand rearing a whole litter to just supervising a few with Mum.