This will be my only post on this matter, and it's to say, don't bother.
Registry cleaners are virtually useless at best and can cause a lot of system instability at worst. Microsoft does not recommend their use nor does any "tech geek" group I'm aware of. Most, in fact, specifically warn against their use. I shall quote something frequently posted on Bleeping Computer by one of our Global Moderators who's also a security guru:
Bleeping Computer DOES NOT recommend the use of registry cleaners/optimizers for several reasons.
Be sure to read Microsoft's support policy for the use of registry cleaning utilities in that topic...Microsoft does not support the use of registry cleaners.--
Brian - Windows 10 Pro, 64-Bit, Version 1809, Build 17763
The problem with values voting is that it completely puts to the side or totally obviates past performance, the effectiveness of policies proposed, intelligence and judgment — you know, the qualities that actually matter for someone who wants to lead the free world.
~ Zareh Delanchian