I have some PCB's that I have ordered from China. The PCB has a BGA component along with traces which go from the BGA component to another BGA IC(USB controller) and finally to USB. Right now I am very interested in 2 lines on a PCB. I think I can find the trace which is going but it is insulated. I dont want to cut the trace and bring out a wire and reattach the wire to the other part of a trace to probe the line on my Logic Analyzer. Is there any other chemical which will easily remove the insulation and expose the copper and help me probe the trace? What are the alternative I have?