Hey the 206 looks awesome, but it can also look quite crappy if it's muddy and not well maintained. Here are some tips to keep your car in great shape. The products i'll be listing here have been sent in by you, or are currently being used by me. If you'd like to list your product here just say so and i'll be more than glad to comply.

CAR WASH

Yes, you do need to wash your car to keep it clean. You can either do that yourself or go to some car station and they'll do it for you (!). You'll need to wash your 206 quite often to remove dirt and debris that can stick on the body work and damage it. Here I can cite, bird excretions that contain acid (BAD). Also, wash your car every time you park it next to the sea as the wind on the beach contains salt water which will  corrode your car.

POLISHING 

Polishing your car is one of the most important things you could do to the body of your 206. Not only does polish keep your car shiny, but polishing create a thin transparent film on your car that helps protect the paint from corrosion by, say, salt water, acid rain and so on. So make sure you polish your car often. Some car polish can also be used on glass, so polish the windows, and lights too.
For those of you who are wondering on how to polish their cars, well, you could read the instructions on the bottle or... Ahem, wash and dry your car, apply polish using a cloth with circular movements; (this can get quite tiresome and boring). Allow it to dry, then remove using another dry cloth.

Recommended products:

        MAINTAINING YOUR TIRES

       I never did this, but i know its done... so it's worth mentioning. Your tires can keep their dark color if you apply one of the products available here.