Whats the best cleaning method for severely dirt entrenched vinyl tile, and what service is recommended?

The tile is about 30 yrs old, and we are not replacing it. Its vinyl tile squares, next to the dirt deep in the tile crevices.I be wondering if steam cleaning is the best cleaning, and what company is recommended to clean it.
Thank you very much

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Answers:    use bleach


discoloration k

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