We are using a kind of watermark treatment powder (A RAINAWAY PRODUCT FROM GERMANY) mix it with water and it looks like "milk" and clear off those watermark by applying on it, we doesn't even need to scrub it! LOL.

Apparently those watermarks are covering up those scratches on your windscreen so when we washed 100% off clearly you can see those scratches more clearly, as you told me that you're staying at a wood factory nearby which is those heavy dust area so when those wood dust drops on your ride and you doesn't clear it off immediately meanwhile then you turn on the wiper blade the situation are worsen, plus you told me that the car is only wash once within 2 weeks time which make this situation even worse.

I believe that yesterday you saw my customer Mercedes Benz CLS 350, that car was washed once a week(ATLEAST), polish and waxed in within 2 weeks, and the silver beauty are still stunning and shine like mirror even though it's already 2 years old and always parked in the garage. There is a reason why I always advice my customer to wash their ride at least once a week! Hope my explanation here are clear even though I already sms you this morning!