Vinegar helps whiten white spots.
The is some stuff called pink in the (African-American isle) in the beauty supply stores, it is great for manes and tails.
You can use show sheen on him and when you are ready to ride you can use baby wipes to take the slickness off of where the saddle fits.

Life's tough, it's even tougher if you're stupid. - John Wayne

You can't argue with stupid!