White thing was stuck in my rats fur?

I have two male Rats and there is always thing like of white/yellow hard soft thing the leave behind in their hammocks. I spoke to the vets about it and he said it could be mucus but I came home from work today and one of my boys had it stuck in their fur and I couldn’t get it out so I actually had to cut it out.... show more I have two male Rats and there is always thing like of white/yellow hard soft thing the leave behind in their hammocks. I spoke to the vets about it and he said it could be mucus but I came home from work today and one of my boys had it stuck in their fur and I couldn’t get it out so I actually had to cut it out. This stuff won’t even come off when I’m washing the hammocks. Should I be worried about it? Should I go back to the vets? Does anyone else Rat have this stuff? Iv tried searching the internet but all it comes up with is mites but my boys definitely don’t have mites. Someone help
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