Cleaning shouldn't be this hard!!! Why make your life this complicated. Genesis 950 takes care of ALL of your household cleaning needs - no need to mix different concoctions, no need to scrounge for ingredients. Find Genesis 950 on Amazon http://amzn.to/2sKCpq2
The shower head is another unexciting area to clean. One quick tip Marker recommends is filling a small plastic bag with white vinegar and tying it around your shower head with an elastic band. Leave the bag on overnight and the next morning the tool will be as good as new.