Long story short I've been battling against extremely poor head retention since i started brewing (almost 4 years now). Tried different mash tecniques, protein rests, grain bills, thoughts and prayers and so far had no luck. Yesterday I was browsing a few threads in this section and saw a few discussions about oxiclean, someone mentioned it could negatively impact head retention. The thing is that I've been using various oxi-something (different brands of "Sodium carbonate peroxyhydrate" - CAS 15630-89-4) as my NO-RINSE sanitizer for my whole (brewing) life because it was recommended in my first brewing kit. Could this be it?