If it can’t speed up your PC’s performance, it’s more like hype or even a scam. The best PC cleaner should live up to what it claims to do. Performance: this is the core part of our testing. Then use Bitdefender and Malwarebytes to run a full scan to see whether the installed program contains malicious procedures. To test each program, we first download and install it on our PC (based on Windows 10). Security: all downloadable applications shouldn’t contain any viruses or malware. Best PC Cleaner Software in 2020: Our Picksīest PC Cleaner Software in 2020: What to Look for?.Best PC Cleaner Software in 2020: What to Look for?.