I have to be honest. Why on earth do you think someone would be interested in your personal hygiene policy?
If there is formulation information which is confidential then fair enough but when someone comes to your site, there is no way you can really ensure that they don't have recording devices on them. One of the factories in the UK was famously put on a whistleblower programme. How did the person do it? Google glasses. Nobody noticed. And tech has got better.
I'd really look at what information is genuinely secret and redact it before showing. So, for example, you may redact the ingredient description and just show codes on a formulation. Tell the auditor up front that's what you're intending to do if it really matters.
I'm finding to be honest though that remote audits are becoming less common in this post covid world. The alternative I guess is asking if you could have it on site instead? It might be at your cost though and as I said, if someone is really determined...