How do I remove "Mop and Shine" from my black tile splotchy kitchen floor?

Hi I have a black large tile kitchen floor that was really shiny when I moved in a year ago...all of it that is. I use Mop and Glow (or is it shine?) but recently my floor has been getting blotchy and dull in some spots and no matter how much cleaning and then shining I do ..big dull splotches.The foor looks dirty in actuality ...it stays dull. I figure the best thing to do is to strip it all off and start with a fresh coating. Any ideas as to how to best accomplish this or even alternate ideas?? thanks very much.

Answers:
If amonia doesn't work then you will have to get a commercial floor stripper. You can usually find it at your home improvement stores.

Other answers:
amonia and water
amonia and water
Ammonia will dissolve it.
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