What sort of tradesman do I call for cleaning up stone work around windows?

[CuddyMum]

I have a Victorian house with lots of stone work around the sash windows. I was thinking of having the stonework painted but someone suggested I get them professionally cleaned up and sealed. Who do I call for this sort of thing?

By the way, they have never been painted and are just looking very grubby :)

Stone restoration company or some stone masons. Google stone restoration in your area.

Thank you again wonky :)

Thank you Toomuchtea! They look great.

How is your new house? :)