I'm not sure what you mean by "stains," but Red Delicious apples normally
have white spots on them. Does this photo look like what you're seeing:
http://botany.cs.tamu.edu/FLORA/dcs4...6/mi06057.jpg?

Suzy, zone 5, Wisconsin

wrote in message
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A lot of red delicous apples have whitish areas/stains on the outside
skin. It is difficult to remove them even when trying to rub them off
under running water. They seem to peel off when scratching with a
finger nail. These white areas are barely visible but I would like to
know what they are. Are they traces of pesticides?