So I've been using 91%+ isopropyl alcohol for years to clean my vape coils and components. While it can take a day or two of soaking, this method has consistently produced clean coils without damage. With the COVID scare, I have been unable to find the 91% or higher in stores. I recently purchased Formula 420 for my bong and Formula 710 for my coils. While I am super impressed with 420, 710 doesn't do as well on the coils. Has anyone tried alternatives like acetone or mineral spirits? If it matters, I have 2 different Coil types I use, both sold under Youcan Tech name brand.