How to force a hard refresh of a webpage on iPhone using Google Search App

I am a web-designer, and I have updated a client's website online, specifically with CSS (style) changes.

I can get the changes to show up on the iPhone Safari and Chrome Browsers, but ONLY after I forced a hard refresh and/or cleared all cache for each browser app.

However, my client usually uses the Google Search/browser App (downloaded from the iPhone App Store), to view her website (as do I). When we look at her site via the Google search app, we can't see the new style changes. So it appears that it is not downloading the new .css file from online.

I have not been able to find a way to force a hard refresh or to clear cache for the Google Search App. (I would have thought it would work once I cleared the Chrome Browsers cache, but it appears they use a different cache area).

Can anyone help with figuring out how to clear the cache for the Google Search/browser App on my iPhone?

Thanks,

SunnyOz