I based a new document on an existing document with index markers and index cross-references.
In the new document there are no index markers, but the topics and cross-references from the old document are still there. These are not deleted (as expected) by "Remove unused topics". I tried to delete them one by one, starting at the top. This works, albeit slowly, but InDesign crashes often while doing it. The crashes seem to come when I try to delete See and See also references whose referenced topics have been previously deleted. I can't find a way of getting past this, and I don't want these cross-references in this book—they're irrelevant here.
Any suggestions?