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#11
Windows disk cleanup tends to be very conservative in what temp files it will remove. Specifically it will only delete files beyond a certain age. The reason being that some applications have different ideas about what "temporary" means and may want to keep these files longer than you may think. Applications create temporary files and can use them for any purpose desired. Their removal could have unpredictable results.
Windows disk cleanup is used by novices who have no idea of the possible implications. They need an extra level of protection. If an individual installs a more aggressive cleaner they will be responsible for any problems it may cause.