Flitz is a polish, ideally used on chrome which is pretty hard. If you are gentle with it - soft cloth and gentle rub it should not be harmful to the finish of your Ruger.
I have not studied the S&W Walther's very closely, but my memory is that the markings on the slide are etched (laser?) not roll stamped like the Interarms version. If that is the case I would be very careful using Flitz on the marked areas. It may remove the darkness and if applied too vigorously could really compromise the look of the markings.
Years ago I learned the hard way that the acid etched markings on the old blued Walther slides are very shallow and fragile. You can just about remove them with a hard glance!
So unless your gun is pig filthy I would avoid flitz on the Walther, and stick with conventional solvents. If cleaned regularly there is no reason your Walther should ever get THAT dirty.!!
I have not studied the S&W Walther's very closely, but my memory is that the markings on the slide are etched (laser?) not roll stamped like the Interarms version. If that is the case I would be very careful using Flitz on the marked areas. It may remove the darkness and if applied too vigorously could really compromise the look of the markings.
Years ago I learned the hard way that the acid etched markings on the old blued Walther slides are very shallow and fragile. You can just about remove them with a hard glance!
So unless your gun is pig filthy I would avoid flitz on the Walther, and stick with conventional solvents. If cleaned regularly there is no reason your Walther should ever get THAT dirty.!!