A fly or two getting in through an open door is normal. Flies showing up in the same bathroom or kitchen day after day, in a Coquitlam home or a Richmond restaurant, is a different story — it means a breeding site has already established itself somewhere close by, and every adult you swat is being replaced from an egg batch you haven’t found yet. Drain flies (also called moth flies) are the most common indoor culprit: small, fuzzy, grayish insects that breed in the slime layer coating the inside of rarely-used drains, floor drains, and overflow pipes. Fruit flies breed just as fast in overripe produce or sugary residue in garbage bins, while cluster flies tend to show up seasonally, working their way indoors through tiny gaps around windows and siding.

Store-bought sprays and drain cleaners kill the flies you can see but rarely touch the gelatinous larval film lining the drain itself — which is why the same fly problem often reappears within a week of “cleaning it up.” Bleach in particular does almost nothing to the organic buildup where the larvae actually live.

We start by tracing the fly activity back to its actual breeding source — a specific drain, a garbage area, a piece of produce — rather than treating every surface in the room. From there we apply targeted treatment to break down the organic buildup feeding the larvae, paired with sanitation recommendations that stop the site from reestablishing. For restaurants and food-service properties across Surrey and Burnaby, we work around active service hours so a fly problem never has to mean closing the kitchen. Serving Surrey, Delta, Richmond, Burnaby, Vancouver, New Westminster, Coquitlam, Port Coquitlam, Port Moody, Langley, Maple Ridge, Pitt Meadows, North Vancouver, West Vancouver, Abbotsford, and Chilliwack.