Diazanon mixed with detergent (breeze)and water. Suds it up and pour down the drain.Let it soak for a while.Put a fan in the room and try not to stay around it.It smells kinda high.
dem is moth and they lay egg on slime. yuh have to get ride of the slime. i surprised dem ting eh work above. If it's the bathroom, cork the drainpipe, pour a whole gallon of clorox in the tub or floor leave it for a 5 mins. Yuh want this concentrated bleach to work so don't mix it. Mind the bleach smells in enclosed space eh cuz it can cut up yur lungs. Then uncork the drain hole and let it drain and leave it for 12 hours to dry. Don't open the pipe to wash nothing yuh want the pure bleach to coat the pipe. Then it have to dry because slime is really bacteria living in water. So the water have to dry for dem to dead.
the slime go come back eventually though. The ting bout using the bio-enzyme, it not going and stay in the pipe for dem to eat and do dey work. That is really for septic tanks. yuh mite have to snake the drainpipe to remove the slime. check the exit pipe too you might see where the ting start.
Just as stated above you have to get rid of the gunk in the pipes. You will have to physically remove it or go the chemical route. The enzymes break down the bio layer. The bio layer is the culprit. I had it with those flies a few months back. They will return eventually but you'll have time to prepare.
Had that issue. I noticed it with certain soaps that very Sudsy shampoos etc.
2. My issue was compounded with poor drainage so the water wasnt flowing and settling. They swim up from outside eat the bacteria and soap scum and then hatch and turn to the drain flies. Sometimes you see the larvae wiggling in the bathroom floor. You need a bathroom cork to plug it when you not bathing.
They will come up to eat scum in the bathroom. Make sure you bleach or clean out your bathroom very well.