You can make standard PVC pretty by ‘glossing’ it. This takes away the dullness and makes it match the glossiness of the furniture grade fittings. It does not help with the yellowing however. You need to read my section on ‘Painting’ PVC pipe to make it match the pure white color.
There are two methods to ‘gloss-ify’ the pipe:
Liquid Tire Shine: This is the best method. This lasts for months (if untouched). All you do is spray some liquid tire shine (use the liquid in a spray bottle, not the spray can) onto a paper towel and apply it to the PVC pipe. Voila! Super shiny! The problem with this method is that is makes it INCREDIBLY slippery and very unsafe if climbed on or used as any type of foothold. But it looks great!
Mineral Oil: You can, with a paper towel, apply mineral oil to PVC pipe to give it some shine. The problem with this method is that it only lasts until the mineral oil evaporates, and depending upon your humidity could be a month, or could be a couple of hours.