White spots on windscreen

[mk08]

Good evening all
I have these milky white spots on my windscreen inside my car which I don't know why are they there.
I have attached picture.
Just a bit of info which may or may not help. I change my cabin and air filer just above a month ago and I only use hearting for Windscreen to warm it up.

Thanks in advance

[GreenV8S]

Are they over the air vents? If so, that suggests some fluid must have blown out of the air vents and then dried on the glass.

[mk08]

GreenV8S said:

Are they over the air vents? If so, that suggests some fluid must have blown out of the air vents and then dried on the glass.

There are some air vents by front windscreen, and I only use them to warm up car. When you say fluids in air vents, where does this fluid comes in air vents from?
Thank you for replying.

[Far Cough]

Looks like dried water marks or similar. They should come off with any decent cleaner or clay bar

[mk08]

Far Cough said:

Looks like dried water marks or similar. They should come off with any decent cleaner or clay bar

Thank you. They are milky white.

[GreenV8S]

mk08 said:

There are some air vents by front windscreen, and I only use them to warm up car. When you say fluids in air vents, where does this fluid comes in air vents from?
Thank you for replying.

It isn't a problem I've ever noticed, but any contamination that has got into the ventilation system would tend to end up at the lowest point which is also where water might collect, so it's easy to see how you might end up with droplets of not-very-clean water carried out with the air in some situations. Unless it's a recurring problem I wouldn't worry about it.