Delete Temporary Internet Files

I am writting an app that will simply track how long it takes to load a couple of web sites.
But I need to clear out the cache programticlly. before i try and go to a page, as i do not wanting it reading from the cache,
I have tried the IE.Navigate, navNoReadCache or IE.Navigate, navNoWriteCache, but those arent supported yet :-(...

So how do you go about either navigating to a page and not writing /reading the cache or how do you progromaticly clear out the cache.

Thanks for the help

Oddprime..