I start by spraying down the liners with Adam's All Purpose Cleaner and scrub them using the Turbo Stick. My car is lowered and there really isn't room to fit my hand in. The Turbo Stick fits in perfect!
Here's a pic of the Turbo Stick on the wheels, I had a pic using it in the fenders, if I find it, I'll post it up.
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Use a high pressure nozzle, like a firehose to rinse the APC.
I let it dry then follow it up with Adam's Invisible Undercarriage Spray. Make sure to whipe off any excessive spray with a shop towel. Once set up, UCS should be dry to the touch.
One reason the Undercarriage Spray might not be working well for you could be old product left on the panels. Try scrubbing the panels really well with a good degreaser like All Purpose Cleaner.
Also, Adam's sells a real nice fender brush for all the people who haven't slammed their Vipers!
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