Sentence:  To sell at the “reconditioned” price ceiling, the used drum must be thoroughly cleaned, <WSD>dedented</WSD>, painted, fully repaired to insure that the drum is liquid tight, and be supplied with the necessary openings, closures and gaskets to make the drum fit for use as a shipping container. 
Meaning of the word marked with <WSD> tags:  To remove a (dent) or dents from.