Attempts to clear DotNetNuke page output cache. Using the PE MemoryOutputCachingProvider

ClearPortal.cs

OutputCachingProvider.Instance(Host.PageCachingMethod).PurgeCache(portalId);

ClearSpecificTab.cs

OutputCachingProvider.RemoveItemFromAllProviders(tabId);

NuclearOption.cs

foreach (var provider in OutputCachingProvider.GetProviderList())
{
    provider.Value.PurgeCache(portalId);
}

foreach (var provider in ModuleCachingProvider.GetProviderList())
{
    provider.Value.PurgeCache(portalId);
}

DataCache.ClearCache();