I am trying to do a PCB toner transfer, however sometimes the transfer is imperfect and the really small traces fail so I would like to start over and reuse the board again instead of etching it.
I then soaked it in acetone instead and scrubbed. But the marks remain unchanged.
Is there a recommended chemical to remove it? I do not want to sand or etch it off because the application is in RF and the design is very sensitive to copper thickness.