I can't seem to find a definite answer to whether washing the solvent with a Sodium Bicarbonate solution or Brine solution is necessary.

I've read reports that it greatly improves the overall purity of the DMT, getting rid of any excess Sodium Hydroxide, thus creating a smoother smoke. On the other hand I have read reports of it greatly reducing yields.

I think someone mentioned washing with minimal liquid, something like 5-10ml per 200ml of solvent. Also using ice cold water would reduce loss of DMT.

Has anyone had any experience with washing the solvent?

just do it. the smoke will be less harsh because of it.

swim recently dreamed of a stb with NO recrystalisation OR freeze precipitation, only two sodium carbonate washes. The second wash was with just barely basic wash-water. Dont let the mix sit long- gentle agitation (gentle rolling of vessel) and drain aqueous layer as soon as it settles.

The stb swim is referring to was pulled with toluene- suprisingly clean spice considering no reX was done! No defat or FASA was employed either- just a couple of quick washes.

OK I'll give it a go then, I've got a 4L sep funnel which makes things a lot easier. Doesn't pulling with toluene extract all the 'Jungle Spice' as well as the DMT?

I do washes with sodium carbonate water. using naphtha with that you dont have to worry about emulsions. I usually use 35ml of water or so for every 400ml of naphtha. Just add it to a sep funnel shake it for a few seconds and wait for it to completely seperate. If you shake really hard that can take a few minutes or so as the tiny bubbles of water slowly sink so dont shake it like your trying to kill it just enough to mix it well.