Dog Screen Cleaner is a novelty app for Android that makes it look like a dog is washing your phone with his tongue!
Turn on Dog Screen Cleaner and immediately a cute little pug starts licking the inside of your phone, making the screen all wet. Of course, your screen isn't actually getting wet, because the dog isn't actually licking it!
Dog Screen Cleaner is ultimately just a video of a dog licking a screen, which plays on a continuous loop (without sound). The looped video is only about 10 seconds long, so the effect doesn't look that good if you stare at Dog Screen Cleaner for a while.
Dog Screen Cleaner is the kind of app that's funny for a few minutes but then you'll be reaching for the Uninstall button.