Resurrecting this thread because I haven’t found another thread that asks this question and while reading through this thread it doesn’t seem that the original question was answered.
Like many people have said above, I have resigned ever needing my guy’s turnout blankets to ever look brand new again. I don’t mind some dirt and mud on the exterior as long as the waterproofing is still working and my horse is dry and warm. But I am curious about spot cleaning the inside of a blanket so that I don’t have to wash the blanket and re-waterproof it. I was using a damp washrag which worked decently well, but figured I would ask if anyone has better ideas!