Mac clean and start a fresh install with out losing Mavericks operating system

I've recently upgraded to Mavericks from Snow Leopard on my Mac Pro.

I would like to now re-install the system so my Mac is completely fresh, with no apps or any data. Basically factory reset.

But I can't find my mac installer discs and I don't want to have to re-download mavericks installer again.

Can this be done?

Thanks