I have old keys in my XP Windows Registry going back for eons. Leave them alone? Should any upgrade have deleted old ones? They appear in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Management\ARP Cache.
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You can try to delete the ARP cache.
- netsh interface ip delete arpcache
Your citation helped and caused additional research, as I have quite an accumulation there, and now I am finding it isn't all Firefox!
This link may help, too:
At least one computer magazine publisher quit acquiring, testing, evaluating and writing about registry software a number of years ago, because they could find no system improvement was evident after a registry product was run.
Other wise systems developers have said that the "perfect" registry cleaner probably doesn't exist; that's it a balancing act between being too lethal (and bringing the system down) or too lite (and a waste of time), therefore each of us must define how squeaky clean we wish to be.
For me it's a curiosity thing!