cleaning granite walls

WE HAVE A 60 YEAR OLD HOUSE THAT IS LEAKING THRU GRANITE WALLS WHEN WE GET A HEAVY RAIN

WE HAVE JUST PURCHASED THE HOME AND WE NEED TO KNOW THE FOLLOWING

 

CAN WE SEAL THE GRANITE WALLS SO THE DONT LEAK THRU

HOW DOE WE CLEAN THE WALLS AND CENENT THAT HOLD THEM TOGETHER WITHOUT HURTING THE LOOK OF  THE WALLS

THESE WALLS WILL BE IN THE DOWNSTAIRS PORTION OF THE HOME 

BUT WE STILL WNAT THEN TO BE NEAT AND CLEAN AND MOST ESPECIALLY     DRY!!!!!!!!

 

 

THANKS IN ADV          JIM STEPHENS