Cleaning removes soil. Color sealing applies a pigmented protective finish to eligible grout. They solve related but different problems.
Start with cleaning
The floor must be evaluated and properly cleaned before deciding whether remaining discoloration is soil, wear, repairs or permanent staining.
When color sealing helps
Sound grout with uneven permanent color may be a candidate for a more uniform sealed finish.
When repair comes first
Cracked, loose, contaminated or moisture-affected grout needs correction before a sealer can be expected to perform.
