Here's what I've found to be the best & easiest way to restore cladding to like-new condition:
Unlike most other methods discussed, this involves an initial deep cleaning, in this case using BLECHE WHITE whitewall tire cleaner found in almost any auto parts store. Spray it straight on the cladding, one panel at a time, and scrub vigorously with a good scrub brush. Rinse and dry thoroughly. Check for missed spots or uneven cleaning. Repeat if necessary. Then apply ArmorAll's new OUTLAST plastic and trim cleaner, being surer to apply evenly. I don't like the provided microfiber cloth, just use a paper towel instead to apply and another to buff it out. Like new in about 30 minutes.
Hope it works for you.