One answer I got from Magna96, see quote.
The first option is browser cache and $Temp & Internet temp cleaner.
You may use this cleaner whenever you want.
The best would be ~ once in mount.
The second options is registry cleaner.
This can help on some ~1 yea/ 2 year => old system but this is not what should be done often.
Once per year should be Ok. CrapCleaner (aka CCleaner) has a light registry scanner
so you can do this and more often if you will but this is not what should be use once per weak for sure.
Btw, do not use any additional registry cleaner and do not use (CCleaner as well) on Windows 8.x systems.
polonus