appears here -
lovebug - Plecia nearctica Hardy
Generally, they are attracted to automobile exhaust, particularly after it has been irradiated by UV containing sunlight. They are also attracted to light colors, and freshly painted surfaces.
The best thing I have found for removing love bugs from the surfaces of one's car - glass, painted and plastic - is a Dobie Pad and warm tap water.
Dip the pad into a container (an old margarine container or soup container from the local Chinese take-out works well) of warm tap water, scrub the "insecticide" with the Dobie, and go on to the next one. When done, rinse the relevant area of the car off with a hose. Rinse out your Dobie, let it dry out somewhere in the garage, and repeat as necessary. You can use it for a couple of years before it needs replacing.