Update: As mentioned I came home two days ago to two bathrooms full of flies, I prob. spent an hour chasing and killing all that I could see.
As mentioned decided to get serious with this, taped up the drain that I suspected and a couple of other drains that I thought what the hell on.
Since now two days have passed, I have seen prob. 12-15 flies, pulled tape and zero flies stuck to it, they DID NOT come up and out of these drains.
I have noticed ( been dealing with these things so long ) that these SOB come in spurts, I removed the tape and ran lots of water down the drains, I am thinking this will re-feed the nests with the necessary moisture to give there breeding another jump start.
Just my observation and opinion is that when I see these large numbers of flies ( like I did the other day ) it is because a whole nest of them has opened.
The 12-15 that I have seen the last two days may have been stragglers that I did not initially kill or these things may have another escape route and my thoughts of them coming from this bath drain may have been wrong all along.
If I have been wrong all along than why is it they will typically go away for sometimes days at a time after I pour the foaming bath drain unstopper down the drain? Strange.
Regardless I have now taped up what I believe is every conceivable escape route meaning all drains in both bathrooms, underneath both toilets and an access doorway that separates the two baths via a sliding hidden door.
I am thinking that ( as mentioned ) now that I have run more water down the drain I will come home this evening to find one of these taped areas just riddled with flies.
My next thought if I see still no flies will be that the flies will not come to an opening and try and escape where they feel no airflow, I will punch tiny holes in the tape if that is the case ( with a needle ) and see if that makes any difference.
BTW been meaning to mention, we have a clean house, we are clean people, cleaner than most in my opinion, this problem is not due to some slobs that keep an untidy home.
As mentioned decided to get serious with this, taped up the drain that I suspected and a couple of other drains that I thought what the hell on.
Since now two days have passed, I have seen prob. 12-15 flies, pulled tape and zero flies stuck to it, they DID NOT come up and out of these drains.
I have noticed ( been dealing with these things so long ) that these SOB come in spurts, I removed the tape and ran lots of water down the drains, I am thinking this will re-feed the nests with the necessary moisture to give there breeding another jump start.
Just my observation and opinion is that when I see these large numbers of flies ( like I did the other day ) it is because a whole nest of them has opened.
The 12-15 that I have seen the last two days may have been stragglers that I did not initially kill or these things may have another escape route and my thoughts of them coming from this bath drain may have been wrong all along.
If I have been wrong all along than why is it they will typically go away for sometimes days at a time after I pour the foaming bath drain unstopper down the drain? Strange.
Regardless I have now taped up what I believe is every conceivable escape route meaning all drains in both bathrooms, underneath both toilets and an access doorway that separates the two baths via a sliding hidden door.
I am thinking that ( as mentioned ) now that I have run more water down the drain I will come home this evening to find one of these taped areas just riddled with flies.
My next thought if I see still no flies will be that the flies will not come to an opening and try and escape where they feel no airflow, I will punch tiny holes in the tape if that is the case ( with a needle ) and see if that makes any difference.
BTW been meaning to mention, we have a clean house, we are clean people, cleaner than most in my opinion, this problem is not due to some slobs that keep an untidy home.
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