QUOTE(shirley_andy @ Apr 25 2018, 01:29 PM)
For cleaning of windscreen/window, what product can I use to clean (especially cleaning away the water mark) and what product can I use to maintain without watermark?
I browsed around and saw Meguiar's G8224 Perfect Clarity Glass Cleaner and Rain-X.
But the G8224 seems like just for normal cleaning, I didn't see it claiming to remove watermark.
Any advise?
You are correct regarding Meguiars G8224, it is more for normal glass cleaning and the properties for the product can probably remove oily residue if normal car wash cant also. However, when it comes to watermarks, there are 2 known methods:
1) Acid solution, however this is not recommended especially for the front windshield as some detailers have said that it can destroy the wiper to work effectively on the windshield after using acid to clean.
2) Polishing using any cream that contains cerium oxide, as this is the method commonly used by detailers to clear watermarks from windshield.
There is also another method, which is to use regular car polish or compound to clear watermarks, however the brand/type/effectiveness of the polish used is often debatable because not everyone gets the same results.
As slk shared in the video, method 2 is most effective to remove watermarks safely.
In terms of protection, again that is subject to debate. Products like Rain-X and windshield coatings can be effective to reduce water from resting on the windshield, however regular cleaning is still recommended.
If u are hardworking, after polishing off the watermarks, try to keep a typical glass cleaner (dont need to buy expensive like Meguiars, just buy those from AEON will be fine) and a microfiber towel handy. Even on days that u lazy to wash the car, u can always just spray the windshield with glass cleaner then wipe off and dry with towel. This regular maintenance can keep watermarks off for a very long time.