For optimal adhesion to most surfaces, clean the repair area prior to ink application. That insures the surface is free of oil, greases and handling soils. For precise cleaning just around the rework area, Techspray offers the TraceTech Flux Remover Pen (#2506-N), which contains a fast evaporating cleaning solvent. Isopropyl alcohol (IPA) presaturated wipes (1610-50PK) are also well suited for surface prep.