Why sandstone needs more care
Indian sandstone is a natural material, so one slab can be softer or more porous than the next. A pressure setting that works on concrete may be far too harsh for it.
The pointing matters as well. Loose joints can be blasted out even when the slabs themselves look fine.
What too much pressure can do
Working too close or holding the jet in one spot can leave lines, roughen the stone or create a noticeably pale patch. It can also push dirt and water towards walls, doors and drains.
What to check before cleaning
Look for loose slabs, weak pointing, damaged edges and any old sealer. It also helps to work out whether the marks are ordinary dirt, black lichen, rust or oil, as they do not all clean in the same way.
The short answer
Indian sandstone can often be pressure washed safely, but it needs the right pressure, distance and technique. If there is any doubt, start with a small test area rather than going in hard.
Not sure about your own property?
If you are in Ryedale or nearby, send Will a couple of photos and a short description. He can usually tell you whether the surface needs a closer look before quoting.