It's a terrace shed that has roof made of tin-can steel.

There are no trees or buildings higher than this.

I wonder how rain has brought this much dirt onto the top of my roof.

Should I clean this or this dirt is nothing to get bothered about ?

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  • 1
    Arizona sand storm
    – Traveler
    Commented Oct 3, 2023 at 0:16
  • I see :) The place where I live don't have any sand storm and the land is clay. But wind can bring from elsewhere like from long distance. Cleaning the roof seems bit risky business.. Should I clean it or would it cause some kind of ionization and the roof will get rusted .. .any ideas ?
    – Amogam
    Commented Oct 3, 2023 at 0:21

2 Answers 2


You'd be amazed how far sand can travel in the air.
I've on occasion seen my car looking like that after a particular wind/rain pattern. I'm in the UK, the sand came from the Sahara, well over 2,000 miles away.

Explainer: how does Saharan sand end up in the UK?

As to what to do about it - the next rain storm will probably wash it all off again. Unless you're particularly worried about the cosmetic appearance, leave it to the weather.

  • Thanks for the link
    – Amogam
    Commented Oct 3, 2023 at 8:09
  • Welcome. . . :)
    – Tetsujin
    Commented Oct 3, 2023 at 8:12
  • I mean, the Canadian wildfires earlier this year were bringing smoke pretty far south into the US.
    – Huesmann
    Commented Oct 3, 2023 at 12:20

Splash from the ground. Pollen. Dust. Yes. (Where else do you think it came from? If someone was throwing sand on your roof, hopefully you'd notice...)

  • The roof is like 30 feet above the ground and I'm not sure if this is really sand or something like calcium or some mineral from rain ? may be I'm overthinking here. But I never expected to see this much on top of my roof. It's probably a year and it has seen just two monsoons so far.
    – Amogam
    Commented Oct 3, 2023 at 0:32
  • Does this needs to be removed like it's gonna cause some rusting or degrading in future ?
    – Amogam
    Commented Oct 3, 2023 at 0:33
  • 1
    It does look a lot like dust/pollen - so either industrial or plant-based, depending on your location. Not much you can do except hose it down periodically to clean it. But I wouldn't worry about it unless I had solar panels. Commented Oct 3, 2023 at 0:56
  • I can hose it down and again it's not necessary. But may be i will do this when I'm free
    – Amogam
    Commented Oct 3, 2023 at 7:32

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