I don't know what browser you're using. in mine (Firefox) it's under Tools > Options > Privacy.

I remember some places where the cache, history and cookies are treated separately but here, Firefox seems to lump them together as "Private data". The option for clearing your private data is mostly for when you've been on a shared computer. Another result, though, should be that any page you load after that will get loaded afresh instead of from a (possibly defective) stored copy.