I have a wide selection of car care stuff including the Megs 3 step system. To be frank I wasn't that impressed, Seemed a lot of work for nothing more than ok results.
The last product I used on my Alfa was Autoglym Ultra Deep Shine which I given for free and was happy with the results.
The actual products you use make little difference from any other it is the way you apply it. Some of the best results I've achieved were using a Wilko £1.99 colour restorer on a rotary polisher and soft foam buffing pad. When I sold the car a mechanic told the new owner it was the cleanest Megane he'd seen and was completely swirl free (those little scratches you see in bright sun) and it was 8 years old and never previously polished.
I'm not going to recommend a particular product because I don't want to be a big up fan boy because it is a particular brand. If I was you I'd stick to a 2 stage polish and wax - buy a good light abbrasive polish and a wax to apply once you've finished polishing.
