Developer's description:

As USB sticks and other flash memory drives increase in storage capacity, so does their popularity as software repositories. Many applications have developed special versions for these devices, usually known as "portable". One of them is CCleaner Portable.

CCleaner is a freeware system optimization, privacy and cleaning tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. Additionally it contains a fully featured registry cleaner. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware! :)

CCleaner's simple and intuitive layout will appeal to users of all skill levels. Its four features -- Cleaner, Registry, Tools, and Options -- are prominently displayed on the left side of the window. We started with the Cleaner first, which breaks down your cleaning options into two tabs: Windows and Applications. The program works by first analyzing your system and then running the cleaner itself. By selecting the appropriate check boxes, we were able to clean our temporary Internet files, cookies, history, and cache in both Internet Explorer and Firefox at the same time, as well as empty our Recycle Bin and rid our computer of Windows log files.

Cleans the following:

* Internet Explorer
* Firefox
* Google Chrome
* Opera
* Safari
* Windows - Recycle Bin, Recent Documents, Temporary files and Log files.
* Registry cleaner
* Third-party applications
* 100% Spyware FREE

In a few words, CCleaner Portable is the pocket version of CCleaner, an excellent cleaning tool with which you can erase unused files, thus gaining back valuable free disk space and making Windows run faster and smoother. The great advantage about CCleaner Portable is that it allows you to do just the same without leaving any evidence of use on the computer. In fact, you don't even need to install it. Simply run it from your USB memory stick and you'll have immediate access to all of its features. CCleaner Portable does create some necessary keys in Windows Registry, but these are deleted when the program is closed, so there'll be no trace of it left on the system.

Regarding its functions, CCleaner Portable does a very satisfactory job. The program helps you to get rid of many different files such as Internet cookies, temporary files, log files or all those leftovers found after months of installing and uninstalling applications. The configuration menu features interesting options like the possibility to keep certain cookies which may be useful for you or the ability to add custom file types to the delete filter. Apart from freeing up disk space, CCleaner Portable also lets you uninstall applications, find broken registry keys and list all the programs set to run when Windows launches.

On the down side, CCleaner Portable does not allow you to undo changes, so you must be very sure about what you want to erase before clicking on "Yes". Also, the program can take a few minutes before finishing the analysis that must be done prior to deletion.