How can I clean stabilising solution from my paving?

[Joelaw07]

Hi - I didn't notice that some stabilising solution I was using on a garden wall had splashed onto the paving through a gap in the plastic protection sheet. There is now a stain on my indian sandstone. I've tried scrubbing with warm soapy water and a jetwash but it's still there. It's basically acted as a sealant - and has penetrated the surface. Any ideas from experience on how to get rid of it? Thanks