It's likely that slimy, snot-like stuff is (was) the powdered cinnamon. This is why I always use whole, cracked or sliced spices & contain them in a hop sack with a couple sanitized marbles to weigh it down. Easiest way to get rid of it is to rack from under. You lose a bit of product, but you get rid of most of the slimy stuff.
Unless you filter, you'l still get some of this sliminess falling out, but it'll be less & less each time you rack.