I often see Scrubbing Bubbles recommended for cleaning vintage Gillette safety razors. I have two Gillette Techs, probably from the 1960's-1970's with the chrome silver colored finish. I have an ancient Gillette Old Type open comb that looks to be brass. The fine print on a bottle of Scrubbing Bubbles says it is not recommended for brass. So, I guess I shouldn't use it on the Old Type. Is Scrubbing Bubbles actually safe to use on the Gillette Techs that appear to be chrome/silver? I would like to feel like I could use the Scrubbing Bubbles on chrome Techs at least. Seems like it would be a good cleaner and disinfectant. I would like to know what you guys think. Thank you.