You have a beautiful new marble countertop. You love it. You want to keep it looking beautiful, so how should you clean it? Less is definitely more. Use a simple mixture of warm water with just one or two drops of mild dishwashing liquid. That is all you need. Your countertop will thank you for treating it gently.
Don’t use any lemon, vinegar or acidic cleaner on your marble or granite as this will eat into the stone. Don’t even use citrus scented detergent. Keep it simple.