Depends what is on them really. If its just grime you cannot beat a good scrub with warm water and soap. If its a bit of cement then a mild solution of pation cleaner will do the job. If its heavy bitumen then it needs to be wormed up and scraped off then cleaned with white spirits. See our project section www.diydoctor.org.uk/projects.htm and look for cleaning paving and patios and removing cork tiles as the process for cleaning the adhesive is the same.
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!