Actually I find the cleanest way to convert DOC is to open it in another tool that does a better job of filtering the output. Atlantis for example creates clean ePub directly (It has clear CSS from word styles and will pass ePubcheck) and this, of course, can be easily edited in Sigil if you need some fancy stuff. Otherwise you are good to go as it is. Other tools include openoffice and writer2ePub extension which has its own forum here at MobileRead.
Dale
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