Just run NetShred and it will remove your existing cache.
No privacy app is going to work if you don’t use it, so NetShred X was designed to be easy to use – just quit from your browser or email program and NetShred X will remove your internet tracks automatically. NetShred X is the internet privacy app for Mac that’s easy, fast and cleaner. NetShred is the easiest way to clear on SSD and erase on HD Internet tracks and email on your Mac.