We had our tile floors and grout professionall cleaned and sealed. The product they used was an aerosol called StoneDefender Grout Sealer. It can be purchased on the internet. Easy to use. While standing, you can spray the grout only. No problem with any sealer that may go on the tiles. Just be sure to cover the bottom of all appliances so no overspray touches it.
http://www.excelsuppliesonline.com/b...z./4,1016.html
They also have a website:
www.stonedefender.com