Siemens Safir32 layer of Glue or Gel how to clean

[raffaell0]

Your e -, I unsoldered the flash, and I wanted to delete with copper welding old, but c?? this layer gummy and sticky.I don't know how to clean it.With alcohol I know that it goes*****and I have to do? Acetone? Appearance response to bring the work to a good end. Even why? I don't know if to leave it cos? would be fine. Thanks20140212_145921_resized.jpg

[egs]

Clean with trichloroethylene......cos? I make and comes out clean...