The ancient Greeks were big fans of marble and granite. They would've loved to have a spray to clean up spills from those giant wine chalices or occasional conquest. Pretty dirty stuff. You're lucky you're not an ancient Greek - you get to enjoy the benefits of this biodegradable spray that is gentle and streak-free.Safe on any surface that water alone won't harm. Safe to use around children and pets and on surfaces or fixtures that these precious ones might come in contact with. method is not dangerous if it comes in contact with skin.