Have you ever been told that something sounds worst than it really is? Well this is one of those times, especially in regards to the games antagonists.
If you read the newspaper clippings in game one, you probably saw the complaint about the animatronics smelling bad and having mucus and blood coming from thier eyes and mouths. Unfortunately, we don't see any of this. In fact, throughout the entire game, the animatronics look well kept.
Ok, I hear the arguments. But let's assume that the animatronics are regularly cleaned up during the day time. Sure, but like any good horror movie or game, things go bump in the night and change. We play a security guard on the night shift which means we would see these changes but not once do we see blood or mucus.
Also, the addition of mucus makes no sense to even be present let alone in the eye for a good reason; ready for an bio lesson? The main kind of mucus within the eye is typically found in the corner of the eyes and tends to accumulate when we sleep. These kids were murdered, not put to sleep. Other kinds of eye mucus would include that caused by allergies, infections such as pink eye, and viral conjunctivitis, which can cause itchy watery eyes. All forms of these eye mucus' are nowhere excessive that it would leak outside of the eye holes of any of the animatronics.
Well, the mucus came from the mouth? Just as unlikely. Mucus in the mouth typically stems from allergy issues that have caused mucus from the nasal cavity to drain into the mouth and into the throat. Excessive salivation is a medical condition, but is more so associated with dehydration. Once again, the kids supposedly stuffed into the mascots are long dead and even if they managed to secrete mucus from the mouth just like with the eyes, you would not see it.