I had a faded 1993 C10, nothing fixed it, too far gone, tried the above remedies to no avail. Sold it, new owner painted them including the saddle bags and it looks nice again. I got a clean 2005 bike, and keep it in the garage. Restoring fade is not realistic, but as you said, you want to maintain what you have. Pledge was recommended locally from a C14 owner, but I just feel better leaving furniture polish in the house, and get a product intended for the bike, anti static feature cuts down on attracting dust and dirt, has UV protection written all over the can, and it does amazing on my brake dust and chrome mufflers too. It's called ORIGINAL SPIRITS in a pink and black can, bike spirits on the second line. $6 a can. I use it on the car too, bug removal is easier to remove when used regularly.