You may not realize it, but everything you do on your PC creates files, cookies or registry entries that end up taking space. iSysCleaner is a free application focused on cleaning up all those junk files. We were a bit put off by the small window interface, which you can not resize. This is particularly annoying when you want to scroll through the log of your analysis. After using the program we've found that it works much better by scanning and deleting individual items instead of doing all of them at the same time.
Another annoying thing in the application is the pop up warning window that appears every time you click the "Clean section" button. There's no way to remove it so you'll have to put up with it.
You can set iSysCleaner to work on system logon and set a priority level for the process. While this is a nice feature it doesn't really serve any purpose, as the program requests to be the only one running every time you need to use it.
iSysCleaner is a solid files cleaner but its functionality is somewhat riddled by some little annoying issues.