Mix it 50/50 with water before applying to make sure it doesn't discolor anything.
You MUST spray off the chunky stuff first. You can use it at full strength or near full strength but you will run the risk of discoloring something. The only time I've ever discolored something was the grill of a truck several years ago. I have occasionally used it full strength on the pioneer and have not discolored anything yet. But to be safe so I don't make any enemies, I will only recommended it 50/50. Anything above that, use at your own risk.
Put it in a pump up sprayer and mist your whole vehicle with it. Let it sit for about a minute with (out drying) and then rinse it off.