I live in a condo with an under-building garage and had Ceramic Pro applied for probably the same reasons as you, b1st. I've had my car since late December and the only time it has been washed, to date, has been when we had a thrashing rainstorm roll through late February and I took my car out and it got a good soak and, with the winds blowing about, it got a pretty good wash. I brought it back into the garage and, like GregW, was pretty sure the rain wouldn't leave any water marks. Even so, I did take my drying towels to it. We have a place outside the building where we can use a hose to wash our cars, and since I've just learned about the two-bucket method, I'm planning to wash it there on occasion. Using the hose, I will definitely dry it off with the microfiber towels. The guy who applied the Ceramic Pro used it on his own cars and said that dead bugs on the front will self-clean from their own body acids although I don't think I'll let them go that far!
2019 Base Cayman
Manual shift, 18" wheels, PASM, Sports Chrono, black tailpipes, cellphone compartment, CarPlay, PE&D