This isn't high-tech, but I posted anyway since I myself like finding videos where people explain also how to resolve simpler issues you may run into when dealing with USB flash drive recovery. IOW people helped me not having to re-invent the wheel, so in return I share what works for me.
This gunk (glue) is used to stabilize the PCB in it's housing and it's just one of the little problems you may run into and need to solve in an efficient and safe manner.
Music - "Karl Casey @ White Bat Audio"