If you use it in time and according to the instructions, it will eliminate the marks from salts on the varnish. If a long time passes and they start to eat away at the varnish, don't expect miracles...

It is indeed a very good product, but I am writing this review as a note regarding the comment about ammonia. Friendly advice, we NEVER use ammonia for cleaning the car windows and generally the car. Never, avoid it. There are specialized products for these uses that come in various prices, quite affordable.

Excellent product from carpro. However, children need to be careful. It is very powerful. It removes salt from windows and bodywork but leaves a white residue. Then it needs to be treated with something else to remove it. I use Ajax for windows and the result is perfect, even on the bodywork. I use different cloths or wash the same one to alternate between them. I don't know if you have years of salt, but it does a great job on a weekly basis. A relaxed pass on the entire car with spotless and then with Ajax.