I heard my drivers door speaker making a funny noise without the key in the ignition, couldnt think why it was doing it or what could be causing it so i carried on washing my car. By the way i heard this noise 5 or 6 hours before i started to wash my car when i was in the garage messing about. I finished wahing my car i started to dry it off, this is when the trouble started, i opened the boot to wipe inside the boot jams looked down to see water in the boot, i lifted the carpet cover off the battery compartment to see the battery and the audio unit sitting in half an inch of water. I took the battery out and the audio unit and opened up the audio unit, water came out and the printed circuit board is in a bad way. The only thing i can think is that i put my car cover in th boot wet the other day and its seeped through what a prat i am. I have soaked the boot and hood with my hose pipe gun and no more water comes in so there isnt a drain blocked. The only thing now is the unit is going to cost £224 plus vat from bmw is there any where else i can try any help will be really appreciated as i have no stereo now!!!!!!!!!!!!!!