Sentinel 319 Citrus Cleaner & Degreaser is an environmentally friendly product designed to clean fuel oil and fuel oil residues found in both residential and commercial situations. Sentinel 319 Citrus Cleaner & Degreaser is uniquely formulated to remove a variety of other soils as well including dirt, dust, grease, and lubricants. Sentinel 319 is powerful enough to handle the most difficult petroleum cleaning projects without compromising the safety of workers or the environment.