Opportunistic feeders, their diet varies from one region to another. In the Antarctic, killer whales eat about 67% fishes, 27% marine mammals, and 6% squids. Killer whales in the Bering Sea (near Alaska) eat about 65% fishes, 20% squids, and 15% marine mammals.
Even though your shower grout looks dry, using it too early or sealing it before it's ready may damage it, leading to premature failure. Most cement-based grouts require a cure time of 48 to 72 hours before applying a penetrating sealer.
Typically, we should seal grout every 4 to 6 months. Even though it is not that much fun to do to, it is important if you want you tile to last and keep it from getting dirty. You need to make sure that your grout is very clean before you apply a grout sealer to it. You should apply at least two coats, but 3 to 4 is even better. Some experts recommend that you put as much grout sealer on until the grout cannot absorb any more. I think this is a great way to do it.