DW is a great place if your looking to take your car care serious, granted there are lots and lots of "sheep" but i disagree with the comment regarding "if your wax aint 500 quid" not at all, a wax will only enhance and protect whats below it, its all in the prep, and most people on there who know what they are talking about will press this early on.
We use many waxes from 40 quid to 2K is there a difference? yes but its very very slight.
I think the key is getting specific products for each stage, a good wash, clay, pre cleanse the wax/seal with specific products will show a huge improvement over your usual wash and Auto glym super resin polish.
There are alot of armchair experts on there these days tho, hence i try (try but dont always do to well) try to stay out of all the junk on there. you have to understand for people who have been on there a while, answering questions like why use a wash mit, or what drying towel gets a bit tiersome after 3-4 years.