Dear Sir. Concerning your issue about the chemical that can be used to make the surface of granite shiny. You may be able to restore the shine to dull granite countertops by removing the layer of soap film that builds up.If you have consistently cleaned your stone tops with dishwashing soap, you need to remove granite soap film. Your best bet to restore granite shine is to remove soap film with a commercially available, professional quality product made specifically for the purpose … and made specifically for use on natural stone surfaces. I think the following below links may help you in your issue:

http://www.granitecarepro.com/remove-granite-soap-film.html

http://naturesnurtureblog.com/natural-homemade-granite-cleaner/

http://www.mbstonecare.com/?Click=13613

http://mbstonepro.com/

Thanks