This is an often misinformed subject. The only product I recommend to spray in your fursuit head to keep it smelling fresh and be bacteria-free is vodka in a spray bottle. I do no recommend Fabreeze, Lysol, Enbac, etc. These are all dangerous to keep in a close environment close to your head. You're not suppose to breathe any of these in or have them come in contact with your eyes or indirectly ingest them. Endbac is indeed used in hospitals, but according to Johnson Wax, they are to be used on non-porous surfaces or hard porous surfaces, none of which you are to in hale.

Vodka is inexpensive and more safer to use next to your head than any of these products. It's a natural disinfectant. The alcohol quickly evaporates and is safe if you breathe it in. Alcohol in hand sanitizer is loads more toxic actually (different type). Vodka has been proven to reduce skin breakouts too as it astringents and tightens your pours.

If you're too young to buy vodka then buy some white vinegar I guess,

So, outside for the fur of the head, I use Armor All interior spray to condition the fur and help keep it stain-resistant. Just spray on very lightly and brush in with a slicker. When it dries, lightly brush again and your fur will be soft and shiny once more. On the inside, spray with vodka.