A garage could be a good place to store your car. It will not only protect your car from dust but keep the temperature inside controlled as well. If you don’t have a garage then I think it’s better if you put it inside a public storage facility. I stored my car once in ultrastor self storage http://ultrastor.ca/ for three months when I went abroad. Or if you have to leave the car outside then you should buy a weatherproof car cover.This will keep the car clean and dry. Water stains or bird droppings can damage the paint so before you keep it away for storing just give it a nice wash and make sure that you properly evacuate the water from the crevices. If you are planning to store your car for more than a month then I would suggest getting your oil changed because a used engine oil has contaminants that could damage the engine. Keep your battery charged. Get the car restarted every two weeks and drive it for about 15-20 minutes. Driving the car periodically can keep the batteries charged and keep the engine and the other components properly lubricated. Prevent flat spots by driving the car for a while this will bring the tires up to their normal operating temperature.