Insects leaving a long trail of sand-like deposit on wall/skirting?
We have some sort of insect or pest leaving a long trail of sand-like deposits along the skirting and a bit of the walls at the corners of one ground floor room! I can't see any ants or bugs or anything!
Has anyone any idea what it could be and how to get rid of it?
I've brushed it off with a stiff brush but it has started to come back?!
Thanks
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