I would contact Cobra via email or phone. They are very helpful and probably would have the best response for this issue. I stay away from harsh chems on matte finishes to avoid shading problems. I use a water softening agent diluted in water to clean my bike and pipes. I use a tbls to 1/4 gallon of water and it works very well. Call Cobra.
Here is my softner that I mix in a garden sprayer along with microfibers.
http://www.autogeek.net/optimum-no-rinse.html
Here is my softner that I mix in a garden sprayer along with microfibers.
http://www.autogeek.net/optimum-no-rinse.html