As with most of the tips here, the reasoning is pretty simple. First, hot paint is softer and therefore more prone to scratching. If you don’t want swirls marring the finish of your motorcycle’s shiny parts, heed this tip. Also, if a bike’s finish is hot, soapy water can dry on the paint, leaving streaks that can be hard to remove. One good technique to avoid streaks is to wash and rinse one section of the bike at a time before moving on to the next section.