This is a great question. The answer is, it depends on the product you are using to seal the grout. Grout Sealers that have a really heavy mixture of Fluoropolymers will leave a residual like haze on the grout if the Grout is not totally dry. Some cleaning companies will use a solvent product to seal the grout while wet, this is a great way to apply a sealer as the solvents do a great job of penetrating through the moisture barrier.
A grout cleaning and sealing service can clean and seal the same day. Grout can be sealed immediately after the cleaning whether wet or dry if you use the right product.
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