Sealing Subway Tile Grout

As part of a remodel, I just recently installed subway tile as a tub/shower surround. What is the best way to seal the grout? There is one product that you can spray on and wipe off. There also is the traditional kind that you apply with a small brush.
Any suggestions would be appreciated. Thank you.
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snipped-for-privacy@gmail.com spake thus:

Use the brush-on stuff; most of the spray is going to go on the tiles, where it is just wasted and you have to wipe more of it off.
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