I have a serious question about when you can use detail spray (choose your brand) and when you can't. I know that many of you are experts at this, so I am counting on your guru-like wisdom. Here's my question--Can I clean my car's exterior with detail spray only when it has minor dirt, or can I also use it for more significant cleaning? I ask because it seems like many people use it all the time and avoid a regular water wash as much as possible. But if I used the detail spray with a fair amount of dirt on the car, wouldn't I risk scratching and swirling? Thanks for your input.