CCleaner running from USB ?

Can anyone help - is there a way of getting CCleaner to run directly from a USB key

I find this program so helpful cleaning other people computers of junk, but I have to install it onto each computer I work on

Thanks in advance

Edited - oops made a mistake, there already IS a portable version of CCleaner - I should've done a search for 'CCleaner Portable' instead of 'CCleaner USB'