The tire has a slight air leak, which was found to be at the junction with the wheel hub.
This type of air leak, it’s not usually due to nails, it’s not due to aging tires. It’s because of poor tire oil from car washes,which can make your tires look shinny and corrode the wheel hubs.
When you wash your car, you apply tire wax, which makes your tires look nice. If it is normal the wash, give you the tire side coated silicon fluid or value higher glaze that is better, to identify the specific method is to use hand to touch, feel is smooth, but there is no denying that this kind of material containing strong acidic or alkaline, some roadside stall after washing a car will come up with a bucket or pot, without any trademarks, use a brush to apply