Well, it's nice when dealing with contagious things when cats don't hang out together. Cinderella may now feel very vindicated not to have anything to do with that new kitty.
Tears are usually clear. It turns brownish because of a red yeast that lives on the moist hairs. So, is what you seeing tears or actual eye discharge? Can you see stuff (technical term!) on his eyes? Maggie's mucous is visible on her eye, but Spencer's tears, which stain his fur brown, are not.
I hope eveything is fine and only a bad memory! Give them all a hug from me!!! And one to you to!!!