One of the managers of the Silestone and granite place that we got our Silestone counters from stopped by today to check up on how well we like our counters (we love them!). While he was here I asked him about caring for our counters. He suggested Windex, Formula 409, a mild soap and water or Simple Green (either the regular or the one specifically made for counters/stone). He uses the regular Simple Green on his own Silestone. One thing he mentioned that I hadn't heard before was to keep hot cast iron pots, pans and skillets off the counters. Apparently, cast iron heats hotter and keeps the heat longer than most regular pans. The quick heat transference from pot to counter could potentially damage the counters, he said.

Hello, If it is a hard water stain, try using a mixture of equal parts baking soda and white vinegar. If it is just water marks, try using acetone to remove and clean away with warm water and Dawn dish soap.

To support what Wilson853 said, per the NIH (excerpt): . New coronavirus stable for hours on surfaces SARS-CoV-2 stability similar to original SARS virus. The virus that causes coronavirus disease 2019 (COVID-19) is stable for several hours to days in aerosols and on surfaces, according to a new study from National Institutes of Health, CDC, UCLA and Princeton University scientists in The New England Journal of Medicine. The scientists found that severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was detectable in aerosols for up to three hours, up to four hours on copper, up to 24 hours on cardboard and up to two to three days on plastic and stainless steel. The results provide key information about the stability of SARS-CoV-2, which causes COVID-19 disease, and suggests that people may acquire the virus through the air and after touching contaminated objects. The study information was widely shared during the past two weeks after the researchers placed the contents on a preprint server to quickly share their data with colleagues. . From: https://www.nih.gov/news-events/news-releases/new-coronavirus-stable-hours-surfaces

That is not fixable. I learned my lesson using an aluminum steam canner on my glass stovetop and it cause that cloudiness. All the cleaning in the world won't fix it. I had the glass top replaced and bought a high temp hotplate to use when I do canning.