[Scottwax]

Sometimes with wheels or fenderwells you need to do just like you would with a traditional wash-use a dedicated wheel cleaner or degreaser. If the car has a lot of bugs stuck to it, I just lay a couple ONR soaked MF towels over the area and then wash the rest of the car. By the time I get to the bugs, they've softened up enough to wash away with ONR. FWIW, I've had issues using convetional wash soap and heavy bug build up and the suds tend to hide and make it harder to get all the crap off the paint.

If you've seen the video I made with the dirty black Cayenne, you can see how quickly ONR encapsulates and removes the dirt.

Regular brake dust build-up, even if it is heavy is easily removed with ONR. Next time I run across a really filthy wheel I'll either take pictures or video the process.