What will keep marker art on mugs during cleanings?

I have made a few projects using sharpies on mugs. I have used regular and oil based markers, markers made to paint on glass, baked them, and no luck with the art staying on - even hand washing the marker comes off. I have chalked it up to the mug and glaze on the mug, but was wondering if anyone has found a rock solid way to preserve drawings/sayings on mugs. Thanks in advance...
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