It is not advisable to wash the car immediately during hot noon or after heavy rain. Under high temperatures, rapid water evaporation tends to leave water stains on the paint surface, and temperature differences may cause the car paint to crack. Additionally, if the vehicle has just been driven through a construction site or dusty area, wait for the engine to cool before cleaning to prevent sediment from scratching the paint. When parked under trees for extended periods, remove corrosive substances such as bird droppings or tree resin first, as high-pressure washing may force them into the paint. It's recommended to wash during shaded hours or on cloudy days using a neutral car shampoo and following a top-down approach. Black vehicles require more frequent cleaning to prevent visible water stains. Regular waxing or sealant application enhances the paint's stain resistance. During the rainy season, a brief rinse can be done weekly, but ensure thorough drying to avoid water spots.