First of all, go easy with your cleaning. As I mentioned earlier, excessive and harsh cleaning will increase your problems with the car stereo. If you see the car stereo display stop working, pull it out as per the above instructions, inspect the wires and gently set it back again. Turn it on and go through the user mode settings and reset (you will lose your saved data though). If it still doesn’t work, your only option is to get it to a repair shop.