Probably just as easy to remove a few bricks at low level externally and remove it by hand. If its an older property it will probably be a lime based mortar. The mortar that collects around the wall ties is known as mortart snots.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!