I had a stuck showerhead that would NOT budge with WD40 or liquid wrench. What eventually worked was putting vinegar in a double layered plastic bag, slipping the shower head in the bag so it is completely immersed in the vinegar, and taping it up for a full day. When that thing turned for the first time, my relief was immense! New showerhead, yay!

Hey Joe, You responded to a 7 year old thread, (look in the upper left hand corner of a post to find the date), but we thank you for the input. Tom