The Power Of Power Washing
This grey color is not an unfavorable trait. Very little you can do about it, it's out of your control, simply clean it and make it look presentable.
Using a floor broom, you can rub with lots of down pressure which assists to loosen all the difficult stains. If it's looking "washed out", and it hasn't been cleaned up in a couple of years, then it's likely time for some money conserving upkeep.
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