Think about what you're manipulating - the temperature. When naphtha gets cold, DMT's solubility drops, precipitating crystals. When it warms back up, the solubility increases, dissolving crystals. If you have very small dust sized crystals, it will take very little time for them to dissolve. Maybe try freezing for 24 hours or making more concentrated solutions, so the crystals are larger and buy you more time. Then when you pour off the naphtha, quickly return the dish to the freezer, upside down, to drip the residual naphtha away from the crystals. Take it out ten minutes later and put it in front of a fan straight away to hastily evaporate any solvent residue that didn't drip away in the freezer. If the crystals get warm while still wet with naphtha, they will re-dissolve. If you live in a cold area, it's the perfect opportunity to put the dish outside after pouring off the solvent, so it stays cold AND evaporates the residue at the same time.