My furbaby has the yuckie eyes

! I've heard about the apple cider vinegar in the water and I've tried it and she doesnt drink the water. I heard it can also come from what she eats. I need some advice on this please. She currently eats Taste of the Wild and Deli Fresh, but only Deli fresh once a day (like a snacky snack) any suggestions on what I should use or be doing to keep her eyes from getting that yucky gunk. I cleanse her eyes daily and she has no problem with me doing so but I just hate to see it an its not attractive. Plus I dnt want it to get in her eyes and mess with her vision. Any/All advice welcome..Thank you in advance

P.S
I'm thinking about switching her over to Wellness. Received some samples so we're gonna start trying that soon and I know not to switch it drastically. Thanks again