Xcode: How to clean all projects, rather than just 1 project?

I have an Xcode solution with 5 projects present. ("Solution" is the Visual Studio term for the overall running IDE instance's main area with all of its projects; I am not sure what the Xcode equivalent term is.) I would like to perform a clean/rebuild on all 5 projects. Unfortunately, when I select Product -> Clean, Xcode only cleans one of the 5 projects. You can see this in the second screenshot below. The project that Xcode chooses to clean (out of the 5) is an executable (application). Of the remaining 4 projects that I'd like Xcode to clean as well, 1 is a dynamic library, and 3 are static libraries. How, using Xcode, am I able to clean every project in the solution, rather than just 1 project? Here are screenshots of my setup. (1) Screenshot of the Xcode main screen, showing my 5 projects listed in the left pane. (2) Screenshot of the log, showing my attempt to clean all the projects in the solution via Project -> Clean. The top (most recent) entry is selected in the left pane. In the main pane, you can see that only 1 out of the 5 projects in the solution has actually been cleaned by Xcode. Thanks! ADDENDUM In response to Martin's answer. I have held the Option key while selecting the Project menu, and I do not see a "clean build folder" option. See screenshot. (3) Screenshot of the Project menu showing, when the Project menu was selected with the Option key held down.