CCleaner Portable is the perfect tool in case we need to clean our system or going to a friend or relative' house to fix its computer.
CCleaner is really well-known by all PC users out there, and this portable version allows you having it in your pendrive and use it anywhere.
Delete junk files, find and eliminate error entries in Windows Registry, delete cookies, temporary files, history,... in short, do the cleaning on any computer.
You'll only have to plug in your USB drive and run it.
We should remember that this is not an official version, but it is a version created by CCleaner forum users.