you could run hot naphtha over the coffee filters if they have some DMT residue on them. Then you could evaporate the naphtha. Be aware that it might not be DMT if it has a brown discoloration. Orange - Yellowish stuff can be reclaimed using toluene.

Are you talking about DMT or some of the byproducts? You might want to try doing this with Toluene or Xylene, as it dissolves some of the more stubborn mimosa alkaloids you may have extracted. then simply evaporate and scrape.