Drain flies in the loo

[MilchandCookies]

They're coming from a loo in a guest bathroom not used all that often.

I've cleaned up and in the rim as best I can with normal cleaner, but there are at least ten adult flies coming out a day, and I don't know what to do.

I used harsh drain cleaner down the drain and plugholes in the bathroom just in case, but I can't use it in the loo according to the label.

Can someone talk me through what I need to do? All the advice I've found on the web is for cleaning normal drains, but nothing on the loo.

Ugh!! We had them come out of our kitchen plug hole in a house I once lived in, so I assume they're they same as what you've got, they just kept coming. Thankfully we were going on holiday for a fortnight so we sealed up the plug hole with loads of soda crystals and put masking tape over it and when we came back from holiday they were gone.

Could you seal the toilet up with tape for a couple of weeks with loads of bleach down it?

What on earth is a drain fly?

I be!ieve that insects breeding in water will drown if you add a little WUL or other detergent, as it destroys the surface tension enabling them to catch air bubbles or climb out in afult form.

If you put some WUL in the cistern it will slowly get diluted but will last for several flushes.

What is WUL?

ashing
p
iquid

I can't get at the cistern because it's behind the tiling ... But I can add a little bit to the loo directly each day.

Failing that, I'll try taping it up and sticking bleach down. Can I put soda crystals down the loo?

Thanks!

Yes you can put soda crystals down the loo :)

if you squirt WUL round the bowl up high, under the rim, it takes several flushes to wash it all away, especially if the bowl is already dry, and the WUL has time to dry before it is flushed.

You will see it takes quite a few flushes to stop foaming.

Ok, thanks.

I've also put a bowl of diluted apple juice with some WUL in it to try attract the flying ones. Not a sausage as yet.