Injectors can be difficult to remove owing to combustion residue attaching them to the engine. Liqui Moly has developed the Pro-Line Injector and Glow Plug Dismantling Aid to help.
The product contains a special solvent. After a reaction time of 15-30 minutes, it softens the caked residue, which can be removed easily. The injector can then be taken out without damage.
To avoid the problem initially, Liqui Moly recommends Pro-Line Injector and Glow Plug Grease. It is a high-temperature paste that prevents solidification and galling.