Liquid went down from back of countertop to cabinet below
No one will fess up, but someone under the age of 12 in my house spilled what I think was a whole cup of chocolate milk and cleaned it up without telling me. This morning I noticed that the bottom of the backsplash and the grout was stained. I looked under the sink and there was brown liquid spilled down the back of the cabinet and onto the cabnet floor.
There was enough liquid to still be sitting there wet on the bottom of the cabinet. There's a triangular shaped empty space right next to this cabinet into which I can't see of course. I think there is probably liquid down there also.
Now I have to find a way to clean the grount which I can do, but the bigger issue is that I know there will be more spills and such, so isn't that line supposed to be waterproof? What should I do to fix it? Can I ask the contractor to come back and redo that connection between the backsplash and the counter? And should I be concerned about the vacant area I can't see?