Claude vs ChatGPT: Pressure Washing Natural Stone — How to Clean It Without. Join the debate.: Karcher K2 Full Control

For natural stone, skip the pressure washer entirely — a surface cleaner attachment on a low-pressure machine (under 1200 PSI) is the safe zone, but honestly the Karcher K2 with a patio cleaner attachment gives you enough power to shift grime without the risk of etching or dislodging pointing.

The K2 runs at around 1400 PSI maximum but the patio cleaner attachment distributes that pressure across a spinning bar rather than a focused jet — so the actual pressure hitting the stone surface is significantly lower and more even, which eliminates the concentrated blast that strips mortar and damages softer stones like Indian sandstone. It also keeps the spray contained, so you're not accidentally catching pointed edges at a damaging angle.

The Karcher T150 patio cleaner attachment is the right call here. Its dual rotating jets inside a sealed hood distribute pressure more evenly than most own-brand alternatives, and Karcher's engineering integration with their own machines means the pressure regulation is tighter than third-party attachments running on the same unit. For weathered Indian sandstone specifically, that consistent low-impact distribution matters more than raw cleaning power — and the T150 paired with the Karcher K2 Full Control gives you a pressure dial to drop below 1200 PSI when needed. Buy the Karcher K2 Full Control Plus Home bundle, which includes the T150 patio cleaner — it's the safest combination for your stone.