No. There is not. If you are seeing green or yellow mucus in the eyes, the problem is now bacterial. This means that the cat will not recover without antibiotics.
Did you just get your pet from a shelter? If so, www.petfinder.com offer 1 free month of pet insurance for your new pet. Just go to the petfinder.com site and click on "shelter care" to read all about it.
Let me know if you still have questions!