I recently cleaned my stainless grinder and Da Buddha vape parts by soaking them in 70% isopropyl alcohol. A friend told me not to throw the alcohol away but to pour it into a shallow baking dish and letting it evaporate and then scraping the dried residue and smoke or vape it. I did pour it into a baking dish and it all evaporated. I'm wondering if this is now safe to vape in my Da Buddha or should I have only used something food grade like Everclear?