IMO, the most critical step in making any silver look its best, is multiple rounds of
compounding with wool pad. The more rounds you compound it, the "brighter" it looks.
Without compounding with rotary, and going straight to Zaino, Klasse etc can also give more than decent results. But IMO, that special "brightness" is just not there.
If I am only doing by hand (as you'll be doing), my favourite step is:
1. Klasse AIO thoroughly - cleans and adds a nice shimmer.
2. Autoglym Extra Gloss Protection. This adds a nice bright, wet look and super slick
feel. If you want, wait 12hrs and do another layer.
3. Collinite (optional) - cos EGP doesn't really last that long.
If you want the max, and decide to use a rotary in the future, compound thoroughly using megs 105with wool pad first as it'll bring out a nice bright look, remove residual swirls if any, and then proceed to Klasse etc. If your clearcoat is very soft, you might wanna use Megs 86 instead of 105.
Did a Merc S-class (Iridium Silver) today, and the owner said it looked fabulous.