A lot of people on the forum use CCleaner available from click here
I use it and it's never given me any trouble. If you use them often you won't see any performance gains but if you use it on a really clogged up computer the gain is massive
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.