Would it be sensitive if I am posting the brand name here? The product is Getf1 watermark removal. I believe it is acidic based, and does not contain ammonia (I think I saw this on the packaging).

P/S: I am not saying the product is not good. In fact, it works well on my side mirrors and side windows. My windscreen might be a special case that it might not compatible with the product.

Hello Silverware, mind to share how do u resolve the problem?? I do not think the tint will cause the problem. I am suspecting the problem is on the external windscreen.

The acid watermark removal is never meant to be used on the wiper area of the front windscreen as there are scratches and stone chip. The acid will fill into the holes of the scratches and make it blurry. This is not the 1st time happened.

The remedy is to polish put the acid at the scratches by using heavy paint correction compound.
The pro will be using Meguair's m105 or Glass Compound such as Osren or CeriGlass

For Consumer - use the glass compound such as Soft 99 Glass Compound Z which is available at Brother's Kelana Jaya for about RM 30+.  If that's too far, you may use Autosol Metal Polisher in toothpaste that is available in any hardware shop or hypermarket. It may cause micro (tiny) scratch, not naked eyes visible but against sun light as it is not meant for glass.

Be prepared to rub and rub (many rounds) to see improvement.

If left uncorrected, the blurriness will disappear after 1/2 year to 1 year time depending on the taken to dilute acid from the scratch. If you cant's wait and want a quick solution and willing to pay, is to sent to the pro detailing shop and the normal charges are between RM 150-RM 250.

Normally, the acid is only used when the glass is heavy stained . Acid is the fastest but not the safest way to clear watermark on windows.

The above are based on actual experience when used a similar acidic product brought at hypermarket.