Fungus gnats in DWC

Hi guys
As per title Im deep into flower which makes it a bit awkward, ive had them before and treated the base of the plant/rootball with neem oil then flushed through with water from the shower head but i dont think ill be able to do that due to the size of my girls.
Can i just make a neem oil spray and spray that on the top of the netpot, would that kill them? What would happen if the neem oil gets into my rez wont that cause problems?
Please if anyone has any suggestions id be mighty grateful!
Thanks

I recently got some microbe lift liquid bti… after 1 application i got rid of some gnats that were harassing me after building a new soil mix… i was using the mosquito bits but the liquid seems like it is a million times more effective… and i only placed a single drop in a 5gal bucket of water (they say to use 2.5ml for like 1,000 gallons or some shit)

dwc420letsgo said:

I recently got some microbe lift liquid bti… after 1 application i got rid of some gnats that were harassing me after building a new soil mix… i was using the mosquito bits but the liquid seems like it is a million times more effective… and i only placed a single drop in a 5gal bucket of water (they say to use 2.5ml for like 1,000 gallons or some shit)

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Cheers i just looked up that stuff and cant get it over here (EU). Been applying and flushing netpot and roots with neem oil today fingers crossed that gets rid of the little fuckers