Clear Cache in Webview Xamarin Forms

Xamarin.Android :

var cookieManager = CookieManager.Instance;
cookieManager.RemoveAllCookie();

Xamarin.iOS :

NSHttpCookieStorage CookieStorage = NSHttpCookieStorage.SharedStorage;
foreach (var cookie in CookieStorage.Cookies) { 
  CookieStorage.DeleteCookie(cookie); 
}