the black crusty left overs in the dab bowl peice, clean it or leave it?

[pressure]

I notice there is a black build up of some sorts on my dr dabber boost. I dont know if its like ultra resin, and I should leave it there for more hits or clean it?

 

[Vape Donkey 650]

clean it. it will taste alot better and help you with your throat issues. it is not "ultra resin" it's dabbing reclaim, which consists mostly of thc that has degraded to CBN, plant gunk and fats, or worse,