How do I remove saved and cached files on Steam Deck?

So I'm currently developing a game and trying it out on the steam deck. However, I can't get rid of the saved files (LocaleStorage and the system Save function). I've used the developer mode to remove the proton files, deleted the game, and even installed decky loader and used the storage cleaner, but it STILL loads up the old saved files.

Is it possible the build is taking local save files with it somehow (I'm exporting using the Linux option)?

On most operating systems, for security reasons apps do not have write access to their own folder, and instead write storage to a separate folder. That folder corresponds to the "<current-app-data>" picker tag in the File System plugin. As the Steam Deck is based on Linux, the folder path will be something like /home/username/.local/share/com.myapp.id. So you'll need to clear that folder to clear the app-saved data like savegames and Local Storage.

Yes, that did the trick!