The car is 1995 c220 w/ 135,000 miles- the car was turned off when the motor was washed. Also, the technician said that the problem must be w/ my valves or piston, because a compression test was done by pulling out the spark plugs and each cylinder was checked w/ cylinder 1 having no compression. I really appreciate the advice- but there are no second opinions around and this is my only car. I don't want to make the mechanic angry, but I have a big problem w/ them doing something that cost $600 when they are not sure what is wrong. The way they explained it to me is that they have not dealt w/ a problem like this before and must pull the head off to rule out the valve or bent piston. Also, they are sure that the water was just a chance thing and has no association.