How to access to cache in WebView from WinForm


I am currently trying to integrate Auth0 into WinForm app with Auth0.OidcClient library and following the example provided Auth0.
My question is what is being cached in WebView after successful login. After the first successful login, it seems like user credentials or token is cached. So when I run my WinForm again, it doesn’t prompt for user credential. It automatically returns successful login result. So if something like token is cached in WebView. I just want my WinForm app to indicate that it is logged in if token is already cached. But WinForm can’t know it until running LoginAsync method. If WinForm can access to the cache and know what is being cached it would be good.
Can any of you guys help me on this?