It is difficult to make white really pop like blacks, blues and reds for example. Getting the paintwork fully decontaminated and polished is a must. You'll struggle to get a wet look on it, so sealants are usually better and give a sharper, glassy look.

For the wheels; I assumed you mean, keeping them in tip top shape...again a deep clean, and then protecting them with something that will last...CarPro DLUX for example, Gtechniq C5 Wheel Amour - something that is very durable, will mean easy cleaning from week to week.