There is no difference in "tek" when using heptane or naphtha, just follow the same instructions.
As for washing or not: FAQ - Should I wash my spice?
https://wiki.dmt-nexus.m...hould_I_wash_my_spice.3FAfter you do the upside down freezer trick or scrape them and filter through coffee filter, you should put your crystals in a pyrex flat-bottom dish, break them up and let them air dry for quite some hours, moving them and breaking them up further, to remove heptane from the crystals. After this is done, you can put them in a closed airtight container, and after a few hours open it up and smell it. If it smells a bit of solvent again, put the crystals back in the dish and to dry some more.
Another option is to redissolve the crystals in non-denatured ethanol or acetone and re-evaporate, which will help removing the traces of heptane. This redissolving process is very effective but your crystals will be yellower/waxier afterwards, which shouldnt affect the experience, it seems to be just a superficial oxidation, and dmt n-oxide is equally psychoactive.
Also, be sure to check this thread:
https://www.dmt-nexus.me...aspx?g=posts&t=11715Be well