There are a few options to this I guess. Assuming the HTML is pretty much the same in alot of posts, for example HTML for a quote box, you could use vB replacements to just hide it.
Alternativly you'd need a script to run through and grab each post, either strip all HTML or try and convert it to vBcode and then update the database. Going on your 97k posts this would take a while todo as you'd have to have around the same number of queries to perform the operation.
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