While developing a project, you create, copy, move, inherit, rename, and delete assets. As a result, an enormous amount of unnecessary files can be created.
Cleaner is a tool used to optimize your project and save disk space by deleting assets that won’t later be used in the final build.
More on using Cleaner in UNIGINE 2: https://l.unigine.com/a2A2n3SB1
Download UNIGINE 2 SDK: https://l.unigine.com/rikNTHJgo