TOC caching issue on IE

Hello all

RH10 to webhelp

I just received a call from an ongoing client. He's reporting that they are experiencing TOC caching issues in IE only. A topic and a book in the TOC that we removed in the latest updates are still appearing in the TOC, but obviously are dead links to topics that no longer exist. He said they cleared the folder and replaced it entirely with the new output files. They clear the cache but they keep showing up. He says they don't have this issue in Chrome.

Any ideas?

Thanks,

Laurie