Looks like adhesive residue on tile? What is it?

4 months ago

I have lived in this home for the last 2 years. The tile I believe was placed 10 years ago when it was built. When I moved in, I noticed the tile around the toilet more than anywhere had a film or adhesive that was starting to peel? After every time I mop, I notice it getting worse and now have a spot appearing in the middle of the bathroom. It feels like sticker residue and if I keep rubbing it, it comes off a bit. I'm tempted on using Goof Off on my whole bathroom but I have no idea if it will harm the title? Or am I supposed to put something on it? Help!

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