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I had painters here about 6 weeks ago. After closing all windows, etc. I had to kill numerous flies - 50?

I am still seeing flies, though not nearly as many in my house. I don't know how they are coming in. I asked the painter to come back and he cannot find that they left an opening in the wood they replaced on the house.

Any ideas?

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my best guess would be its either something has dies under your floor, or a sewer cover has been left off/open... unless of course they used bright yellow paint, which attracts flies... – Digital Lightcraft Nov 18 '13 at 17:27
Duplicate? diy.stackexchange.com/questions/13667/… – Niall C. Nov 18 '13 at 17:40
Are these typical black flies? Or small flies like fruit flies? If they are fruit flies then they are not "getting in" but perhaps a piece of fruit was left in the trash bin... most citrus fruits are already full of eggs we just consume the fruit before the larval stage... – Matthew Nov 18 '13 at 22:59

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