Although our paving slabs are only about 5 years they were a bit dirty, I found. But as with so many things, you can see across the passage of time over it and feel the dirt does not seem so bad. Until my husband came up with the idea with the Kärcher, I initially did not want to share. Since we almost always shopping at Amazon, we have called the 'tens of Kärcher, compared and then "stuck" in this. As usual, it was delivered within two days. Within minutes of the Kärcher was ready and off we went. What I had been kept quite passable for even at our paving stones, turned out to be absolutely filthy. My husband had just tried a little bit, but we saw immediately that the plates looked like new. Even the moss and weeds were small between the joints with torn - but the dirt splashed around everywhere - no problem with the great result. And when I saw the result, I was thrilled. 120 bar are entirely sufficient to make the old new again. We would recommend this model of Kärcher any time further and buy again.