Can you connect a known good wire from the ignition coil secondary output directly to an external spark plug that is firmly touching grounded metal ? To do it safely stay away from the intake manifold and fuel distribution.

If you have spark under that condition then the problem is in the distributor cap or rotor. Caps / rotors / wires can become waterlogged or carbon tracked and short out the ignition voltage.

If no spark then it could be a coil or ignition amplifier problem.

I would not crank the car with secondary wire disconnected from the coil. Under that condition the secondary voltages go higher than normal and could damage something.

Did any water go under the hood during the car wash ? The distributor might get wet if the rubber seals at the rear hood - firewall upper edge are loose.

Mike