TBH, the first person I saw do this was my wonderful vet, 25 years ago. He looooovvvvs my poodles, even though he's a golden retriever guy. (He was convinced Mike was a golden in a poodle suit.)I know it sounds disgusting, but I've always thought that letting the dog eat them is a reward for holding still enough for me to get them out of their eyes.
And yes - they've all loved it as if it's a special treat. Makes face grooming a lot easier, eh?