There is always water still in-between the windows and the tint. Do not wash it, if the shop didnt tell you all this then i would question there proffesionalism. Do not get a car wash for a week, do not unroll your window also for a week. Do not wash the tint for 30 days, and like roan said, dont use ammonia it eats the film. The water spots will be gone in 45 max depending on the weather. If you wash it, you risk messing up your tint.