Drosophila melanogaster attacking my plants!

Drosophila Melanogaster also known as fruit flies are all over my plants! They are still vegging though and no hard on the plants but this will be a super issue for flowering! I read some network articles saying to clean my soil from rotting leaves and such, but that'll be a task with not great suit for me. Is there an easier way to tap those little bitches and destroy them once and for all? I'd love if I know a medicament to spray them with or just add sort of medicament to my water ... Something to god damn KILL THEM ALL! I got my plants infected with these from the plant of a friend ... He wanted his plant under my roof for a week so his parents will not notice the plant ... Now his plant is fine, but mines are fucking full of fruit flies ...

EDIT: Oh my gosh it is Fungus Gnats not fruit flies ... My bad!

EDIT 2: As I continue reading, Ground Cinnamon is quite a nice way to get rid of Fungus Gnats, I also saw that sterile sand about an inch on the surface of the soil will kill them all at once! Anyone have experience with these two?

Edit 3: I think the best solution could be Chamomile tea, I am not familiar with biologic and chemicals but I reckon that Chamomile tea is the most natural and non-harmful way to get rid of those little Fungus Gnats!

Let the soil dry out they should move on

Already tried, they won't go away and my girls started drying out as well ... :/ The leaves started to tilt down and they looked dry.

hmmm that always worked for me I don't know some people talk about mosquito dunks but I wouldn't to that. if it is not an organic soil I might add some h2o2 to my next watering that should dissolve those little bitches on contact. usually if I let mine dry out significantly between watering I don't see a problem thy move on out so I can't help you on this one

HashSmoke420 said:

Already tried, they won't go away and my girls started drying out as well ... :/ The leaves started to tilt down and they looked dry.

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Nematodes work well for gnats and I also hear the don't like rosemary oil.