Killer whales, also known as orcas, are toothed whales. Here they are, dancing in the aurora that occurs in the northern hemisphere. I would love to see the Aurora Borealis someday, but I don't like the cold.
The simplest way to clean up an oil or acrylic painting on canvas is to use a white cotton cloth soaked in a gentle soapy water; olive oil–based soap works wonders. You’ll be surprised to see how much grime comes off. Be gentle with paintings with thick impasto, as you do not want to break hardened paint