We just had granite counter top installed in our kitchen(Japanano Bourdeaux). It is light brown(pinkish) with black spots. A day after installation, we see some brown spots(almost like burnt) in some areas. We have not even used the kitchen yet. Please help. Is it possible that the initial sealent wasn't fully done. Need help on a) remove the stain and b) how do we maintain the stone so that this doesn't happen again. Do we need to apply any sealent every few months?