In one sentence, describe what the following article is about:

Click the multicolored Windows logo in the bottom-left corner of the screen. Doing so will search your computer for the Disk Cleanup program. If your mouse cursor doesn't appear in the text box at the bottom of Start when you open it, click the text box before typing. This program's icon, which resembles a flash drive with a brush on it, should be at the top of the Start menu. The Disk Cleanup program will open. You may have to click the Disk Cleanup icon once it appears at the bottom of the screen to open the Disk Cleanup window. Click the checkbox to the left of each item in the Disk Cleanup window, scrolling down once you reach the bottom of the window to view more options if necessary. It's at the bottom of the window. Disk Cleanup will begin deleting temporary files from places like the "Thumbnails" cache and the Recycle Bin cache. Once this process is complete, Disk Cleanup will close.

Summary:
Open Start . Type disk cleanup into Start. Click Disk Cleanup. Check every box in the Disk Cleanup window. Click OK. Click Delete Files when prompted.