Based on our record, CleanMyPC seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The CleanMyPC app scrubs the relevant registry when it uninstalls other apps. But your prescribed step 3 (scanning registry for "waterfox" after uninstallation & restart) did yield an escaped entry with "waterfox" in the entry (path/address), so I deleted it before restarting and installing. Source: about 2 years ago
CleanMyPC (to note that they are no longer maintaining nor updating this app). - Source: dev.to / over 2 years ago
Avast Cleanup - Next generation tuneup and cleanup for your PC
NinjaOne - NinjaOne (Formerly NinjaRMM) provides remote monitoring and management software that combines powerful functionality with a fast, modern UI. Easily remediate IT issues, automate common tasks, and support end-users with powerful IT management tools.
Wise Disk Cleaner - Clean junks of Browsers, remove junk and useless files of Windows and Defragment your disk. Wise Disk Cleaner can delete these unnecessary files on your hard disk to free up disk space and make your computer run faster.
Microsoft Operations Management Suite - Microsoft Operations Management Suite enables user to gain visibility and control across the hybrid cloud with simplified operations management and security
SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.
Atera - Atera’s all-in-one platform enables IT professionals to gain access, visibility, and control over all their networks and devices from anywhere, so they can work smarter and light years faster.