Naphtha
From DMT-Nexus Wiki
Naphtha VM&P is the solvent of choice for extracting freebase DMTin an Acid Base Extraction or Straight To Base extraction.
Naphtha is a combination of organic non-polar petroleum distillates that evaporate clean (leaving no residue). The reason they can pull the freebase DMT is because freebase DMT is non-polar itself.
Naphtha is harmful to the environment, it is best to reuse it (or if your a hard core environmentalist, to not use it at all and instead try out the non-toxic limonene.