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This problem has been noted on Challenger forums and is thought to be caused by improper storage (unheated, with uncontrolled humidity). It’s compounded by use of dressings or protectants...

Meguiars Final Touch Detailing spray and AG pressurized spray bottles.

I bought a pad washer almost as a goof and now use it religiously. Powdered MF detergent with clean water makes the pads good as new. Just follow the instructions and do the initial spin drying...

Technique for me Mike. I've experimented with a variety of products but it wasn't until I focused on learning the right way to do things that the results improved.