DEAR BARRY: We have a major problem with drain flies under our house. We've called a plumber and an exterminator, but both say they've never seen this kind of problem before. We've also had the septic system pumped and inspected, but this doesn't seem to be the source of the flies. What should we do? --Tracy DEAR TRACY: Your exterminator should know about drain flies. These pests breed in the soft, organic matter that coats the insides of drainpipes. To get rid of them, you must thoroughly remove the slimy residue in the pipes. This cannot be done with common drain cleaners, nor with boiling water or bleach. Instead, there are special products called "drain gels" that are specifically made for this type of drain cleaning. But before using drain gel, solid residues such...
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