It's an OK app. It's not bad, but it's not great either. When you 1st start it you'll see the Dashboard, which lets you perform an Express or Intensive scan & clean, which doesn't give you a say in what's deleted, but it does let you back up everything that is deleted, with files stored in .zip files in the Users\ [UserName]\ AppData\ Local\ Abelsoft\ folder. If you move down a notch on the left side of the app's window to Cleaning, you get more choice. Here you perform a system scan, then move to the next step, which is your cleaning options. There are 3 headings that vary from super safe to more intensive to extreme, with each listing categories of files to be removed. Each category lists the individual files, but you can't select or deselect them -- you can only turn a category on/off. And it lists the amount of space that will be regained by eliminating the files in each category, though bear in mind that if you have backup turned on you won't really gain anything, since the files are moved rather than deleted -- you have to remember to go back and delete those backups once you're sure everything is OK. WashAndGo really likes to suggest deleting temporary files -- it seems to select every file with a .tmp file name extension, and everything in any folder named Temp. It also goes after all sorts of log files, and if you're using the extreme range, icons. My results testing the software may have been limited since I used 2 relatively clean copies of Windows -- I went through my usual cleanup routine after Update Tuesday prior to performing backups. In my Win11 VM it picked up on ~700MB of Windows Update Delivery Optimization files that should have been deleted with Disk Cleanup but were not. It's possible that it'll pick up on other stuff that I already got rid of with my normal cleanup routine, making it more valuable for some folks. If you select Tools on the left hand side you'll see a tool to find duplicate files, a Disk Usage Visualizer, & a tool to remove unnecessary apps.
Installing WashAndGo has minimal impact, with the program's folder at ~67MB, a folder in Users\ [UserName]\ AppData\ Local\, and a registry entry for uninstall.
My after update cleanup routine, FWIW, & in case anyone's interested, starts with running Windows Disk Cleanup, using the option to clean up system files. Then at a Command Prompt running as Admin., I run dism /online /Cleanup-Image /StartComponentCleanup . Then I use the cleanup options in Microsoft PC Mgr. After exiting PC Mgr. I delete C:\$WinREAgent if it exists, make sure the OneDriveTemp folder holds 0 bytes, delete anything in Windows\ LiveKernelReports\, delete the C:\Windows\ SoftwareDistribution\ Download\ folder, clear both of the Windows Temp folders [Users\ [UserName]\ AppData\ Local\ Temp\ & Windows\ Temp\], clear any restore points [Settings -> System -> About -> System Protection], and use WizTree to check for anomalies, e.g., more that a relative few MB in Recovery\ & System Volume Information.
If you want to go further, and are not risk adverse, you might check out the Wise Disk Cleaner, but I suggest performing an image backup that you know you can restore first.
wisecleaner[.]com/wise-disk-cleaner.html