Gearbanger 101 said:Well, it they've been on there a while, the Gunk stuff doesn't work all that well. Also, applying it on a hot day doesn't help, because it dries up on you too soon and just makes a mess. You'll have to use a little elbow grease in that case. Wet it down for 5-min or so first to soften them up and try cleaning them off with one of those plastic woven Scotch-Brite scouring pads and some dish soap and water.
Can't believe you would even show one of these to the car! Not sure if you can get it in the US, but there's a product called PROLONG (think they have a website) that's sold here in the UK as a "waterless wash". I only use it to get rid of the bugs, they wipe straight off with little effort using a standard cloth.