I recently used the Autoglym gel - looks good for a while but as with any product like this it doesn't last. Get yourself some bumper spray paint from Halfords and do a permanent job... I did the front nose grills at the weekend and they look like new. Thought I'd try it on the black bit on the door panels too - masked up the windows and paintwork, 4/5 light coats and they are back to black from the faded look they were. Cost of the paint - £6.49. Neither were a hard job but have given the car a nice spruce up.