By careful experiment it has been seen,
that boars prefer their apples clean!
Well, they claim to have observed this in some wild European boars:
"Here, all adult pigs and some juveniles of a newly formed group carried apple halves soiled with sand to the edge of a creek running through their enclosure where they put the fruits in the water and pushed them to and fro with their snouts before eating. Clean apple halves were never washed."
Why would you bother to clean
something already pristine?