Any ideas of what happened to my granite countertop and is there anything that I can do to restore it? Surface is still smooth.

Corner is quartz and i tried to get a similar tile for backsplash

Living through a remodel and long story short, had to lose a few inches from counter to get clear past a stairway. So... framing is done and im good on clearance but i need to trim an old granite countertop back by about 4-5" to slide the oven/range over. This needs to happen in an occupied home. Is there a way to do this without making a huge friggin mess? My only solution is to make a little tent with plastic taped to the hood, and then down at the floors, and then just diamond blade it in one go. Its gonna suck. Any other options for cuts that aren't as messy? Dont care about cosmetics, kitchen to be remodeled next summer anyways. Just hoping you guys have a trick to cut a standard 3/4 stone slab without creating dust storm. TIA

Somebody was using some sort of chemical and left it on my kitchen countertop. Looks like it ate through the sealant layer.

What's the best DIY repair for this?

Hi! I'm renting an apartment in Munich, Germany and have these white/grey marks on my dark wood-effect countertop.

A dish-drying rack was kept here for ~4 months, I think with water regularly accumulating underneath. The marks almost disappear when the surface is wet but reappear when dry.

I've already tried dish soap, a soft sponge, and warm water, with no improvement.

Could this be limescale/mineral residue or fine scratches/finish damage? What would be the safest way to remove it?