keeping the exterior clean

[Ms Grumpy]

I have a question, 15 years ago I owned a light silver car. The car sat outside and about every 4 months I would notice that the car looked dingy. Someone suggested a product called color back to get all the "grime" off the car. I tried it and it really cleaned up the paint. Now I have a car that is 4 years old and is a lighter colored silver and I was wondering if anyone has used Color Back on one of the newer cars. I know the paints and clear coats have changed over the years and I was wondering if it damages the paint. Thanks for your input.