I've got gnats everywhere! Tried all kinds of stuff but they're not going away. I figured out I could sterilize the mix in the microwave and cooking those suckers has given me surprisingly great pleasure.
So here's the plan, I could sit back and watch my cuttings die a slow death and maybe 1 or 2 will make it, or I take serious action!
I'm gonna cut open each uline bag, inspect the cutting, if roots, I'll spray w hydrogen peroxide mix and pot in sterilized mix with mixed in shredded dunks. If there's rot, I'll remove it and commence to scrub w soap water, dunk in bleach soln and dry, then dip ends in paraffin wax and rebag in new uline with sterile medium and mixed in dunks. Then place in new sterilized bin in a room far away from the contamination zone w a sticky tape across the top, underneath the lid. All unsalvageable cuttings get pitched. All infested soil goes in gallon zip locks w approx 2 lbs per bag then in the microwave for 2 and 1/2 minutes to cook those suckers! That mix will all be used to pot plants in future.
It's time to reclaim the land in 5...4...3...2...1...Bring It On Little Buggers!!!

Nicotine is toxic to bugs...well anything!  Try putting used cigarette buts in the top or buried inch under the dirt probably about one or two per inch of pot.   I have used them in hanging baskets and containers.

Timmy2green,  I like your plan.  It's better than a slow death.  Good luck with all that survive!

Suzi

Haha greenfin has me cracking up! Still disinfecting containers over here before we commence wave 2 of the attack.
Thanks Suzi, the gnats are the ones that will need some luck today ;)

Good Luck.
Be sure to locate and destroy the source of your infestation or it may happen again. Also keep the top of your containers dry, it will reduce their numbers.

Hi Timmy2green,
Before you drop a new nuclear bomb, just try this : - I got it from a really wise man - :
Get a vacuum cleaner and aspire every flying beast - when you can - once a day for instance.
Get aluminum foil and seal each bag around the cutting with the brilliant side of the foil to the outside - that will reflect light and disturb the flying creatures.
Keep your baggies on the dry side.
So far, I got rid of the flying creatures .

Timmy, you cannot see their tiny eggs, larvae gets inside the cutting.  if you are going to open one by one, you ought to get some mosquito dunk and soak the entire container for a few minutes, it gets very wet, so you plant them in a bit bigger container, so you add dry soil around to soak up the excess water.  add dry soil on top of the container also.

using the vaccum to eliminate the adults is a good idea, also hang a bunch of fly traps over and around the plants, those are cheap. each adult caught is 300 less bugs in the soil

Wow, do you know if they lay eggs in multiple soil locations?

I don't know, but think, that if lets say 5 bugs are there...they are all laying "The number of eggs laid by female fungus gnats ranged from 21 to 217" according to this paper http://www.ncbi.nlm.nih.gov/pubmed/16539117

so, I would be hesitant to reuse any portion of the soil, without doing something with it. if you soak the cup in gnatrol or other gnat dunk, would help, but if the lavae is already inside the cutting, it is almost all over, sometimes cutting off that infected part and restarting is better. it is awful, that I know. Hope the best for your plants. 

Thanks Grasa! Yeah that's the basic premise of my plan. Microwaving the mix should kill the larvae, rotten wood removed and trashed, remaining wood cleaned and soaked in bleach, mix laced with shredded dunks and wetted with liquid bti. Then sticky tape as a failsafe.

I was lucky enough to have my first experience with gnats recently as well. I was watching my cuttings going down hill quickly and removed every cutting one by one and re-cupped or re-potted. I re-potted with a 60-40 mix of perlite and sphagnum peat moss. To wet the peat I used a water can with BT added. I haven't seen one gnat since! When I removed the cuttings I also pulled off any rotten roots and if the end of the cutting was rotten I re-cut up to  healthy wood and just put them back in the cup with the new mix. The jury is still out on those! A few of them were just trashed as there was no coming back. I was able to salvage one node on a Kathleen Black and several nodes of Texas BA-1 and grafted them on to my LSU Purple. Fingers crossed they make it and I will air layer them this season.

Thank you Suzi for BT recommendation, it worked like a charm!

It was too much for me to get through in one day because I decided to go back and sprinkle shredded dunks on young plants in pots and water with BTi.  So I will continue the project tonight.  This is going to be a multi-day effort.