I've noticed this morning, my neighbour's car was full of water on the inside of the windscreen and mine wasn't, I am just lucky I guess, however it is not normal. A quick fix, until the real problem is found and solved, is few socks full of cat litter sand under the seats. To check for where the humidity comes in through...check for any missing or loose rubber caps between the engine bay and inside the car, door trims and water leaks. I personally wouldn't be scrapping (or wiping with a cloth for that matter) the inside of the windshield. Leave the heat on for extra minutes if required. Hope it helps.