I have heard and googled conflicting advice over whether or not to
reapply sealant to a granite kitchen countertop. Our countertop was
presumably sealed upon installation 4 years ago but nothing has been
done since.

So, what do the Usenet experts here recommend for upkeep of a granite
countertop?

Also, Home Depot for example sells a combo package with cleaner,
disinfectant, sealant, and polish.
Are any of these "potions" worth applying?

Thanks?