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I have noticed that house flies seem to have become immune to Raid fly killer. Wasps and blue bottles go down quickly, but the smaller house flies appear to be wearing NBC suits.
I wonder if this stuff would do the trick https://cpc.farnell.com/w/c/tools-m...?product-range=pro-power-freezer-spray-series
Claims to drop the temp to minus 50°C in 2 seconds.
I wonder if this stuff would do the trick https://cpc.farnell.com/w/c/tools-m...?product-range=pro-power-freezer-spray-series
Claims to drop the temp to minus 50°C in 2 seconds.

