Just noticed this on my window (external), it has been raining for a few days last week not sure if that's related.

Location: Melbourne, Australia.

  • What is it?
  • How to deal with this?

enter image description here

1 Answer 1


Those are mud-dauber wasps. They're good guys. They paralyze spiders, take them back to their nests, and lay eggs on the still-living spiders.

So if you don't like spiders around your place, leave the mud-daubers alone! Their homes are made of harmless mud, and they do not harm the underlying structure.

If you really despise them, you can simply scrape them off with a paint scraper. But they do no harm, so why not let them be?

  • 2
    That's one weird definition of 'good guys'...
    – Tetsujin
    Commented Jul 21, 2022 at 9:16
  • 1
    Doing that will probably increase the number of flies around your home, with fewer spiders catching them.
    – Tim
    Commented Jul 21, 2022 at 9:47
  • 1
    Considering there are quite a few people with a fear of spiders (and of course regions where these can be actually dangerous), it'll depend on how afraid you are of them vs how much you dislike flies.
    – MiG
    Commented Jul 21, 2022 at 10:03
  • 1
    Considering that the 10 most deadly of everything live in Australia, @Tetsujin, something that kills something that's deadly to humans is generally classed as a "good guy". ;)
    – FreeMan
    Commented Jul 21, 2022 at 12:38
  • thanks, definitely afraid of spider specially in AUS :D
    – Nigel Fds
    Commented Jul 22, 2022 at 4:26

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