I think that the most recommended polish here is Duragloss, which I can personally attest to, but also many owners have had good success with other products like 3M marine wax, Maguires, etc. Some people really like Rejex, but I personally didn't care for it. Some searching will probably provide you with a handful of threads on the topic.
Many of us use a mixture of 4 parts Duragloss 923 and 1 part Duragloss 952 in a spray bottle for cleaning the interior and as a touch up spray on the exterior, cleaning off bugs and such. I don't know who first came up with that mixture, but it really makes the interior shine.
On the exterior, I think waxing twice a year is the typical recommendation, adjusting for use, climate and storage conditions.
I don't know if I remember a discussion here on which type of pads to use.