After graphene transfer, solvent mixtures were used to remove residual PMMA, which efficiency was estimated by AFM, Raman spectroscopy, and CVC. That post-treatment gives: stress relaxation (2D peak shift, compared to trichloroethylene), 2D/G intensity ratio 1.1 changes to 2.6, clean graphene regions exceed 100–150 nm size; threshold point shifts to zero but the conductivity and mobility reduce. Ethanolamine functionalizes both PMMA and graphene.