How does WidePath cache sites?
Caching happens automatically when you create a new site with WidePath. Stuff that gets cached are regular urls like this:
If there are any parameters in the query string, if there are any cookies sent by the client, the page will not be cached. This includes being logged-in to WordPress since this requires cookies.
When you update a page or post, the cache is invalidated for the url that you're editing. This means the cache is for just that particular url gets deleted and the next request will be fresh.
If you want to purge your entire site's cache, simply login to WidePath, go to the site you want and while on the 'Properties & Hostnames' tab, click the 'Purge Cache' button at the bottom of the left panel.