| For a quick wash that doesn't leave marks I use the Flash Car wash system, it was something my wife bought me for a birthday present a couple of years ago , I hadn't even thought of it and I was sceptical but I think it works great.( I think it's about £20) It's available in Halfords. For really cleaning my car properly I use Meguiars products.Again these are available in Halfords.
I use the meguiars clay bar to remove all the surface contaminents, it only need doing every 6 months or so, an amazing product that leaves your paint feeling like glass( with the quick detailer I think it's about £11.I then wax the car( it's a meguiars wax, can't remember the name or cost). Sometimes (particularly after I've been to the dealers and forgotten to tell them not to put my car through their car wash and it has come back with swirls and spidery scratch marks in the paint) I use meguiars scratch x which gets rid of them(I think it's about £8 or £9 pounds for a tube..
Other people will have different opinions of what brands are best but for me Meguiars is the only product range that I have used that hasn't dissapointed me.  | 
