Back from holiday and....maggots in the bathroom?!

Got back from holiday yesterday afternoon. All was well. Then around 8pm I noticed two worm like small things in toilet bowl. I didn't think much of it except being grossed out and flushed. This happened two more times. And following online advice I bleached and poured in boiling water, (usually would do this 2x weekly but have been away, the drains in this house are rubbish!). Then, I found two in the middle of the bathroom floor. This happened 4 times, either one or two just on the floor. The bathroom has since been gutted, and bleached from top to bottom, and I thought I solved it as there has been none all day. Then I found another. And now I'm really grossing out, it's embarrassing, disgusting and this is my only bathroom!!!!
the ceiling is neatly panelled with no gaps, the loft is above and I have had a look in it, there's no flies, smell or buzzing.
There is a fan in the centre of the ceiling, could they be falling from there? Or squeezing from under the shower? There is no flies, there was none before I left for my holiday, and there is none now. I'm really not sure what it could be, where it could be from and what can I do about it?!?!

Mod note: member is in UK

 

Step one is you have to find out from where they're coming.

 

There has to be something rotting (meat) for flies to lay eggs which thus become maggots!

 

It might not be maggots. They could be sewer fly larvae (Drain Fly) which look similar to maggots but are smaller. They feed on organic material so the best thing to do it clean out your drains of hair, etc.

https://www.orkin.com/flies/drain-fly/

 

Thanks. I and find any source, and there has only been one more for 24 hours now. I read about drain fly larvae, can it be those if there on the floor too? There's nothing rotting, checked the loft too. The bathroom is clean, honest! I had family stay before going on holiday together, so the house had the frantic 'family are visitng' extra clean! 😋

 

The ceiling fan where the duct work exits the exterior wall may have a dead bird inside it.

Another possibility is a dead bird/rodent in the attic/loft under the insulation where the van exits the bathroom ceiling. Sometimes the fan and duct work become unhooked of compromised which leaves an opening for insects. Can you crawl over to where the ceiling fan is and lift insulation to inspect? Maybe you can inspect where the fan duct exits the exterior wall, too.

 

Even though it is extra clean drains can have lots of organic debris. Yes, you will normally find the worms on the floor, especially if there is a drain there. I had some one time in our shower, I snaked the drain and cleaned it out of hair and junk and haven't seen any since.

 

Good point Tolyn; Just like the underside of the rubber overtop of a garbage disposal, some parts never get cleaned because they aren't seen. I've seen shower drains in locker rooms that have a lip or rim that catches organic matter but the water still drains so there does not "appear" to be a problem.