I use 'Vista' by Concept Chemicals at work, its the best stuff i've come across personally, brings the colour back a treat. Its liquid to be applied with a small sponge or rag, and once its dried it wont attract dust because its not sticky, wont run after its got wet and lasts for weeks. Rub the excess off and you'll get a nice matt finish, or leave it to dry and it'll give a semi-shiny finish.