WENT ROUND MY FATHERS 2DAY AND HES JUST SPRUCED UP HIS GROUTING WITH SOMETHING FROM EVOSTICK, GROUT REVIVOR.
Came in a tube with a foam applicator on the end which you sqeezed and spread over grout then washed off, seemed very effective and only £3.99 from a local store, not sure whether you can buy it anywhere though

stu
ps sorry about shouting at beginning
