My husband and I purchased crackle finished green subway tile for our kitchen remodel. We installed it 3 months ago. I sealed it with 511 Impegnator before grouting and a few days after grouting. The area behind the range looks great, the area behind the kitchen sink has spots all over. It looks like water splashes but no matter how much I scrub/buff, the spots won't go away. It's driving me crazy. And we always wipe the area down when we're done doing dishes so I'm not even sure why it's happening.... We spent $600 on this tile, not to mention all the time & effort that went into installing it so I'm disappointed, to say the least. I looked online for answers, but haven't found any solutions. I've tried vinegar, Magic Eraser, dish soap. Nothing works. I'm hoping someone on here has a fix. Thank you!