Okay I'll chip in too.
But first, that's a weird one,man. Almost sounds like a personal problem.
Anywho, do we know for sure that meth won't cross over in any way into naptha? It is a hydrochloride, so is water soluble,we know that, but could anything cross over used in the synthesis?
My suggestion would be a water wash first, then pull with naptha as suggested. That should clear out all that poisonous shit. Hopefully.
Sine experientia nihil sufficienter sciri potest -Roger Bacon
*γνῶθι σεαυτόν*