Burung Layang-layang - Glossy Swiftlet at my porch

This Glossy Swiftlet has been roosting on my front porch for the past week. If not for the stains of drooping on my shoes, sure I didn't notice it up there. They start to cling their small short legs onto the vertical wall at 7.15pm and out and about by 6.30am.
I notice they are in the process of building a nest. I'm in a dilemma now, whether to let the Swiftlet continue their activity (and have a photography session) or destroy the early nest because of waste /pollution.
My wife grumbled about having to wash the garage every day. She told me to get that shit away!.
I have to find the solution fast.



Shiny blue-black -Glossy Swiftlet (Collocalia esculenta cyanoptila) -
There are 32 subspecies and cyanoptila Oberholser, 1906 - distributed in Malay Peninsula, Sumatra, and lowland Borneo.