Hi staticvoidlol,
If you need to clean and rebuild your project, and don’t want to have to rebuild the Engine as well, you can delete the Intermediate folder from your project in step 3 in addition to the Binaries folder. Then you would do a normal build of the project in Visual Studio, which will recreate all of the project files that would have been recreated when performing a rebuild, but without rebuilding all of the project’s dependencies (such as the Engine).
The class still being present in the Content Browser after following the steps listed by Cø may not be correct. If you have not already done so, could you please create a new post regarding that issue so we can track and investigate it?