I have several plants indoors and altho I have had a gnat issue in the past.....lately it has been horrible. So have taken them outside to dry out some. I keep a jar of apple cider vinegar on kitchen counter....which does catch them....but I want to kill them all...pronto. Have not seen any indication that anything is attached to under side of leaves. Found recipe for lemon soap and water to spray them with after they dry out. Does anyone else ever have this issue ?