More likely you have picked up some road gravel or a rock large enough to rattle. Visually inspect the Catalytic Converter to see if there is a rock bouncing around in it. If not then a replacement would be necessary since there would be nothing to tighten up.
If you are talking about the headlight washers, all you need to do is drive the car with the headlights on and press the windshield washers. It will push fluid onto the headlights and the windshield at the same time.
You have to remove the overhead control unit (front dome lamp assembly) to gain access to the sunroof motor(link below) You can then put an allen wrench/socket into the drive motor for the sunroof and turn to close. This works if the sunroof motor has failed. If the problem is the switch, you might get lucky by pointing the key at the IR pickup on the driver's door handle and holding the lock button. That should close all of the windows and the sunroof. Mercedes 211 overhead mirror removal
Sounds like the fuses didn't give in time, or an internal fuse blew inside the radio. Although fuses rarely make a poping sound, usually more a condensator (also called a capacitor, or cap for short), or a burnt IC chip. You will need to take the radio out of the dash and open it up to inspect the electronics inside, see if any condensators have a popped top with fluid leaking or similar, and check for burn spots on the IC chips. Also, you might want to check the resistors just in case the pop came from one of those but they usually burn out slow so they don't go pop. If you do not feel comfortable taking the radio unit apart, then best bet is to replace the unit itself with a new/aftermarket one. Hope this helps.
