Clean Options (Detailed Items)

Delete tags for Excel only, which are no use for browser at all. Such as <o:p>. This option will only take effect on unfiltered web pages.
Refine StylesFrom office 2000, MS Excel will generates inline styles for every item inside your file, no matter how many times it repeated. This function will resort them into style sheet and replace inline styles with style class names.
This will greatly reduce your file size, while keep all original appearance, strongly recommneded.
Delete futile codeMS Excel always explicitly but unnecessarily writes default attributes values to each item, we can assign these default values only once in stylesheet, and delete them all. Other default values are unnecessary at all, just delete them.
Omitted values include language definition, zero values, futile values. If your file can be previewed correctly, check this up.
Optimize TablesExcel file is composed of cells. So does the excel generated HTML. But HTML tables (cells) generated from Office is always full of garbages. So table garbages is the main item of the garbage of Excel HTML.
Additional
Remove DynamicsSome Excel file will contain dynamic content, such as tips, popups. This can be implemented via Javascript in HTML, and will be performed in conversion. If you don't need them, you can remove them in cleaning.
Discard Source Code FormatIf you needn't read the source code any more, you can check this up to save additional spaces.
Discard HTML headA special option only in extreme scheme (pure HTML), for copying of embeding the result HTML as a fragment.