Lou2, honestly, I do it my self. I got a quote from guy who called to my front door, 150 Euro, I laughed at him, then closed the door. I went to the hardware and got some cleanser (removes dis-colouration and moss) mixed it with water and sprayed it genrously I used a spray gun you can buy in Garden shop for about 5 euro (the ones used for spraying flowers that you refill). I then came around with a good yard brush and it came up like new instantly. Actaully I have cleaned it since with just water and some washing up liqiud and the elbow grease does the rest, its only dis-colured due to the elements mostly mud. In anycase worked no prob for me and my neighbour deos his now as opposed to dishing out money every year.