Find out where the larvae are thriving: do you have natural fiber rugs or animal pelts or lots of pet/human hair concentrated anywhere? Is there by any chance horsehair plaster in your house? The larvae feed on keratin (in hair) and the adults leave to find dried veg matter.
any chance horsehair plaster in your house?
It's definitely possible. The house is from like the 1880s or something. and there is a horse and buggy cart in the back. (no horses currently)
human hair concentrated anywhere?
I think I shed hair more than the average person and I'm constantly removing so much hair out of my vacuum roller. The place is also carpeted, and the carpet is getting old.
thanks for the information
I deal with these little bugs every spring
If they keep coming back, then they're living somewhere you're not aware of. I'm personally anti-exterminator, but this is a situation that absolutely calls for professional help. Vacuuming will never be sufficient
We got rid of ours by removing upholstered beds and switching from carpet to hardwood. All fabrics stored in the affected area went through the dryer before we stored it elsewhere. Never saw them again.
Get rid of any cardboard boxes. They will nest in the crevices in the corrugation. Move anything stored in cardboard boxes to plastic bins or such.