High-quality removers use microfluidic technology (like Wurth Injector-EX Go to product viewer dialog for this item.

Based on the description provided, you are looking for a review of a (often marketed in Czech as "uvolňovač vstřikovačů" ), a specialized spray designed to safely dissolve soot, carbon, and corrosion to free seized fuel injectors.

) to seep into micron-level clearances between the injector and the head. Many top-tier sprays, such as

Unlike generic penetrants, these are formulated to dissolve carbonized soot and resin specifically, rather than just lubricating.