Best way of getting retained eye caps of in my experience is to get a rough textured bath towel and soak it in warm water then let the snake repeatedly slither through the towel , when it's head pops out at one end cover it up again with the loose end of the towel - remember to apply VERY GENTLE pressure on the head / face / eye region and after 5 minutes or so the eye caps will be gone ...
I'd never risk any kind of tape to be honest , not even that decorating tape we call "masking tape " over here in the uk - just my take on things ..
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