I live in the Boston area and have about 500 necco bricks which will be used in a patio on my 1182 farmhouse. Any tips on how to clean these (mortar,etc.) would be most helpful. Also, I would LOVE to BUY more of them and if you HAPPEN to know of a good web page in which to do so I would appreciate it. I haven't had any luck on my own. THANK YOU SO MUCH!!!