How to hide miniprofiler?

I'm using MVC Mini profiler to check the speed of specific parts of my application, and would like to keep it there just in case something happens later and I may need to check "what's going wrong". It's not a full log set, but it comes pretty in handy to know what's making a page take long.

So, my goal is to hide it and have it profile only when the request comes with a specific parameter. However, none of my attempts have worked in the way that I would expect.

This has done the trick of not showing it on the screen (code in a view):

@if (Request.QueryString.AllKeys.Contains("showProfiler"))
{ 
    @MvcMiniProfiler.MiniProfiler.RenderIncludes()
}

This is the attempt that got closer. Correctly hides the mini profiler info, but at the moment I show it, it profiles everything since I stopped showing it. So, let's say that I profile my page and it takes 3 seconds. I remove the query parameter and load the page three more times. I add my parameter again and I see 4 sets of profile information. That implies that it keeps track of everything and I wonder it if could give memory issues.

Attempts to make that not happen anymore:

Attempt 1:

protected void Application_BeginRequest()
{
    if (Request.QueryString.AllKeys.Contains("showProfiler"))
    {
        MiniProfiler.Start();
    }
}

Attempt 2:

protected void Application_EndRequest()
{
    MiniProfiler.Stop(!Request.QueryString.AllKeys.Contains("showProfiler"));
}

Attempt 3:

protected void Application_EndRequest()
{
    MiniProfiler.Stop(true);
}

None of these worked. Any ideas?