The article recommends an "abrasive cleaning pad" be used on the exterior of aluminum-cladded building sections to remove pitting. These are the pads used for cleaning tile and are generally a white "non woven" pad similar to those found on the back of a household sponge. The key is the color of the pad; white! If the pad cannot be found at your local grocery store, they are usually available at one of the big box stores or at an industrial hardware supply store. Be sure the pad is white. These pads are sold in other colors and they vary in abrasion depending upon the color and possibly the manufacturer. For consumer use, the product is usually called simply, a tile scrubber.
As to the root cause, I'm wondering if you frequent the seashore or park the coach near a pool? Salt in the air and pool chemical vapors are very hard on aluminum surfaces regardless if they are painted or anodized.
Though contradictory to the owners manual, I'm thinking a mild abrasive pad soaked in vinegar will effectively remove those dots if they are salt or chlorine related. That architectural article suggested a small test application first. Try a small area on the roof or the underbelly where it won't be seen as readily. If it successfully removes the raised dots, try another small section. Remember, this is to be done in small sections so as to control the application. Once completed, the area should be given an overall "acid" bath with the vinegar and then washed with a soap and water solution and then finally rinsed with clear water and dried. Afterwards the aviation polish can be reapplied or I would suggest Protect All, which is much easier to apply. The worst-case scenario is the necessity to replace the infected panels with new ones.
