I need help with grout cleaning and mildew issues.

We are moving into a rental house in FL. The kitchen and bathrooms have tile floors and the grout is very light. Some spots are really dark (from dirt?) and I'd like the easiest and quickest ways to clean them please. Also, there is a shed on the carport that smells like mildew and I would like to clean it so I can use it for my Christmas decorations but I don't want them ending up smelling musty. Any suggestions? Thank you
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