Angelwax Blue Rinse is a wax-infused rinse aid for the last step of the wash. You spray it onto the clean, wet car and rinse it off, and it leaves a water-repellent layer that makes water sheet off the paint, so drying is quicker and there is less chance of water spots. It also adds a smooth, glossy finish.
It is a concentrate. Dilute it up to 5:1 in a foam lance or pump sprayer, spread it evenly over the washed and rinsed car, leave it for a moment, then rinse thoroughly with clean water and dry as normal.
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