No abrasives like magic sponges. No bleach. All of that will damage your cabinets. Try Peroxide. Microfiber. Just the same 3% kind you’d use to clean up a knee scrape. Plain soap and water is all you should ever need for liquid spills on cabinets. If soap and water doesn’t do it, then you have a coatings issue. Real cabinet manufacturers do not use paint. Manufactured cabinets coatings must pass KCMA certifications tests that involve resistance to stains. All bets are off for anything else staining in the future if these are back yard custom or home house painted.

Thanks for the suggestions and confidence! Our installer recommended using acetone, but I didn't have any around and was slightly concerned it might take off the sealer as well. In the end I gently used the magic eraser and then rinsed well and wiped dry and I no longer have the pink marks! But just a note that Quartz and Quartzite aren't the same thing. Luckily it seem to have worked for me, but I did test it on the old sample piece I had laying around first to make sure.

I would suggest carrying the vinyl planks into the kitchen. That looks like colonial white granite, so I would go with white subway tile backsplash. Make sure to get samples of the backsplash to compare to your cabinet color and countertops (you wouldn't want a bright white backsplash with off-white cabinets). Also, depending on the variation in the actual slab of granite you chose, colonial white should work with most off-whites (BM Simply White, Cloud White, White Dove; SW Pure White, Alabaster, Snowbound are good examples of off-white). If you are set on tile, it should be from one of the colors in your granite and should not have a pattern. It's a good rule of thumb to have only one pattern in hard finishes (most tiles are blotchy in color which means they have a pattern). ETA: I don't see any reason why the island needs to have a contrasting finish. I will borrow this from Maria "boring now equals timeless later" :). You don't want each finish to be the star. In this case, the countertops have the pattern and will be the star and everything else will nicely support them. Then, your styling, décor, artwork, etc will bring the kitchen to life from there.

"Yes, plywood holds screws better than MDF, HDF, and particle board (which require special screws.) Ordinary screws work in plywood." Technically screws may hold better in plywood however the potential difference is not likely of any consequence in this application. Also, when mounting cabinets to the wall the screws used do not typically have threads up to the head of the screw, the shank is free of threads for at least 1". So in this case there are no threads in the plywood, just in the supporting stud. The only thing preventing the cabinet from falling down is the force it would take to pull the head of the screw through the plywood or particle board, no threads are involved. You make it sound as if the screws for particle board are out of the ordinary "Special Screws", they are no more special than any other screw, deck screws, drywall screws, wood screws, subflooring screws. Available every where and cost the same as just about any other common type of screw.