As above, soaking the front would be best. Maybe lay some wet cleaning cloth over the area to keep the dampness against the dirt.

Motoring shops should also sell small sponges with a net/mesh covering. The sponge holds the water/suds and the netting gives a bit of a "bite" to move the dead flies but go careful aa heavy use might damage the paint but I've used mine on the front and door mirror housing with no problems - just keep it wet and with suds. They are handy little sponges to keep in the car with a bottle of water if you are going on a road trip in the summer as they clean the grime off the windscreen a treat.

Soak with water.

Apply one soft bristle brush. Stir frequently.

Keep doing it..

Edited by madf on 18/10/2010 at 17:19

Wash car. Spray on Autoglym Motorcycle cleaner to fly blown areas, leave a minute or two, rub with an old paintbrush to loosen flies. Hose off. Repeat as necessary, but DO NOT let the cleaner dry on the paintwork it may remove the shine permanently..