Wet behind the ears…..car wash issue

So I gave my cube it’s first bath today (bought it clean in late October and then winter hit and it really didn’t need a wash until now). Hopped in to leave the car wash bay and the key wasn’t detected. The key WAS detected outside the car and allowed me to lock/unlock the doors. But the key dash light came on as soon as I pressed the brake pedal. oddly there was water dripp8mg from the rear view mirror to the dash. Are there electronics/sensors in the mirror arm or in the dash under the mirror that might have got wet?
Had the cube towed home, assuming it needed to dry out whatever got wet.
It got cold last night (so anything wet was now iced). This morning I went out and it started up. I had no intention of driving it anywhere so I left it to run for about a half hour. When I went out to turn it off the VDC, ABS and low traction dash lights were lit. I pushed the button to turn it off and left it for the day. Came home and battery was completely dead. Pulled battery, charged it up, put it back and when I connected it, all dash lights including dash illumination lit up. Pressed start button and engine cranked but wouldn’t fire. Pushed button to stop the cranking, all lights went out but then all came back on again. Tried pushing start button without brake depressed and same result - everything turned off but then came on again. So without a way to turn the car off I disconnected the negative battery terminal. I’ll try a cold start again tomorrow morning and if it fires will turn heater/blower on high and leave it run to fully fully dry out.
Thought I’d start this thread in case anyone has had similar behaviour/issue.