How to effectively clean the memory of WIN7 C disk?

WIN7 clean C memory memory solution one: the computer comes with the cleanup
This is the system's own disk cleaning function, open my computer, right on the disk that needs to be cleaned --- [attribute] -- - Under the General Options----Click [Disk Cleanup], and the computer will start to calculate the junk files that can be cleaned under the disk.
Check the junk files that occupy the C drive---Pull---check all the files that occupy the disk space, and then click --[OK]
If you have some unnecessary installations on the C drive The application can find [Programs and Functions] and [System Restore and Shadow Copy] under [Other Options] next to [Disk Cleanup] to clear unwanted applications and stale backup files!
Delete some The installation files downloaded by the program, such as downloading the movie files that have been read, and the CF files installed, these large files will take up a lot of C disk space if they are downloaded to the C drive, which affects the system running speed, so all the files are deleted. (It is also possible to cut to a C drive).
WIN7 clean up C disk memory solution 2: use software to clean up
Software cleanup has its own strengths, but the basic policy and the above manual steps are the same, the biggest bad is advertising annoying (have to go advertising version) of). As shown in the figure below, the ones that can be cleaned are checked by default. Click on the analysis. After the analysis is completed, click [Run Cleaner] to clean up, so that all the disks of the entire computer are cleaned up (not only the C drive)
The software integrates many cleaning functions into one piece, which is very convenient. It can be cleaned up in one go. The software like the above can clean up the system garbage, clean the registry, and clean the software. Which method to use, or to see your hobbies, I would like to use software to clean up + manually delete some software to C drive stuff.