So I can better understand, you have a batch of "meth" from your distributer (I think you need a new one *a real one*) and it's cut/has MSG and wax in it? I'm just very curious as to why someone at distribution level like the guy himself is destroying an almost flawless damn near pure product of methamphetamine in the first place . If I had to take a better guess I'm willing to say that this "distributer" (sorry I need to laugh my fucking ass off for a second) ah, ok that's better. Willing to say that you are dealing with a wannabe low end middleman and whom is either really young or just flat out an illiterate hick.
Back to Business - the classic acetone wash. You can just dump the bag of shards in a glass cup or pyrex glass if you wish and pour acetone into the cup, stir it around a little bit and drain the liquid acetone out. The remainder acetone will evaporate so fast Into the air that your product will be dry and ready to go. Hopefully that wash gets all them kindergarten and autistic cuts out of the meth. One thing I used to do was apply heat under the glass cup with the shards and acetone in it and once it bubbles stop the heat and drain it out the cup viola!
The real/actual way ,well proper way to wash is to actually crush up the shards into a fine powder and then apply acetone.
I'm sorry you got a bad batch. I am recommending to cut your loses and never deal with that kind of a hustler again