To Seal or not to Seal?

    Hello, I have Blue in the Night granite from Namibia. I was told it needs no sealing or care, is this so? I did a water test with paper towel, and I didn't see any water darkening stain. I've had it about 1 year now, looks gook but not like it use to. Can I still polish it, and whats the best day to day cleaner, I use antibacterial windex right now. Its eems not to leave any streaking, and i guess kills all germs, is there somthing better? Also, i've notice two small scatches on surface not deep only surface(they look like little white lines). How do I go about buffing them out? Any help appreciated, tx.