To completely avoid introducing scratches into your paint, you need to understand what causes the scratches in the first place. The majority of scratches and swirls are introduced during the wash process. I always utilize a 2-bucket wash method, coupled with two wash mitts and a foam gun.
Basically, I rinse the car completely down to knock off the big dirt. Then, I foam the car down with a foam gun. This is a very important step as the foam gun lubricates and raises the dirt up off the paint that is matted to the paint. If you wipe across a car with dirt matted to the finish, that dirt is in then ground into the finish creating swirls. Here's a shot of me using the foam gun in my garage.
Foam Gun of Full Foam
After I have foamed the car down, I then begin my 2-bucket wash technique. I bring soap from one bucket, go across an area, and them take the mitt to a second rinse bucket. By never contaminated my wash bucket with dirt that I am removing from the car, I do not introduce dirt from one section of the car to another section of the car. I am basically removing the dirt and putting it in a different bucket. This means that my wash water is always clean.
Another thing that I do is use one wash mitt for the top half of the car, and a second wash mitt for the bottom half of the car. These mitts never touch the wheels, undercarriage or anything else other than paint. This keeps them pristine.
I explain my entire technique and then some in a detailing video series that I've
posted on You Tube. Detailing is a passion of mine and fixing messed up paint is something I love to do. Here's an example of some of the goodies I have had to deal with. This is a Brilliant Black Dodge Charger that someone keyed from the front quarter to the rear quarter and then tried to fix with touch up paint. To make matters worse, they smeared the touch up paint into the scratch which really made it look like crap. Then they parked the car outside in a wind storm while the paint was still wet. Needless to say, this car was a hot mess!
The Specimen...
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Using a polisher like the one you see me using in these pictures is so safe that I can teach a kid how to use one.
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... and now for the finished product!
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She's back to her original beauty.
Correcting your paint is relatively easy if you have the correct products and tools. The secret to perfect paint however, is to not damage it in the first place. The 2-bucket wash method is the key to NOT having to fix your paint in the first place.