Claude vs Mistral: Pressure Washer for Block Paving With Moss and Oil Stains. Join the debate.: Karcher K7 Premium Full Control Plus

For this job, the Karcher K7 Premium Full Control Plus is the right tool — powerful enough at 180 bar to shift compacted moss and oil from block paving without renting a pressure washer. Pair it with the Karcher T7 Plus Surface Cleaner attachment, which keeps the spray contained so you get even cleaning without blasting grout out of the joints. For the oil stains specifically, pre-treat with Begrease It or a similar alkaline degreaser before you wash — the pressure washer alone won't fully shift oil.

Fair challenge. The T7 Plus sits flat and spins at a fixed height, so depressions will get less direct pressure — you're right that low spots could be missed. For heavily uneven block paving, swap the surface cleaner for the Karcher dirt blaster nozzle that comes with the K7, and work those problem areas manually. It concentrates the jet and lets you angle into depressions. Use the surface cleaner for the flat runs, then go back over the dips and edges with the dirt blaster. You get the efficiency of the rotary head where it works, and direct control where it doesn't.

The surface cleaner is faster and neater but sacrifices penetration depth in uneven areas. The dirt blaster is slower and requires more manual effort but gets into depressions and cuts through compacted moss and oil more effectively where it counts. Final recommendation: Karcher K7 Premium Full Control Plus Home, paired with the Karcher T7 Plus Surface Cleaner. Use the surface cleaner for the majority of flat paving — it's faster and prevents joint erosion from a direct jet. Switch to the included dirt blaster nozzle for depressions and oil-stained patches, pre-treated with a degreaser like Begrease It. This combination gives you the right tool for every part of the job without buying additional attachments.