Steam Cleaner

Steam Cleaner is a tiny application that promises to delete leftovers after uninstalling Steam games from a computer, in order to free up space. It also supports Origin, Uplay and GoG Galaxy.

Clean Steam, Origin, Uplay and GoG Galaxy leftovers

The tool is wrapped in a user-friendly interface and lists all leftover files and folders at startup, showing the full path to each object that can be removed. Worth noting is that it doesn't actually clean the Steam cloud library since it only looks for files installed on the current PC.
It's not necessary to install Steam Cleaner since it's packed in a single executable file that can be dropped anywhere on the disk and just double-clicked to bring up the main app window. However, if you encounter any errors, make sure to see if .NET Framework is installed on your computer since it cannot work without it.

Remove all leftover files in one go

The interface is clean and intuitive. As previously mentioned, all files left behind by game uninstalls are displayed at startup, so you can scroll this list to find out exactly what objects can be deleted with this utility. The number of total found file along with the accumulated file size is shown on top.
It's not possible to exclude any files from deletion, so it's a good idea to check if you need anything. Confirmation is necessary to get rid of the Steam-related files. There's also a refresh button available to run another checkup after the initial cleanup job.

Speedy and straightforward game cleaner

There's nothing else to be added about this lightweight program. It doesn't have customization options but these aren't required when considering the straightforward goal of eliminating files left behind after uninstalling games via Steam, Origin, Uplay or GoG Galaxy. It simply spares you the trouble of manually checking your computer for these remnants. Steam Cleaner worked smoothly on Windows 10 in our tests.