This is how I clean my Blackstone Griddle, it is not the only way, but it is my way.
Keyword: Blackstone, Cleaning, Cleaning a Blackstone Griddle, Griddle
Equipment
Metal griddle scraper
Materials
3Paper towels
1Squirt bottle filled with room temperature water
1Squirt bottle filled with canola or vegetable oil
Instructions
While the griddle is still hot from cooking, scrape the surface with the metal scraper to remove any food debris. Work from back to front, pushing everything into the grease trap.
Squirt water onto the hot surface. The water will steam and sizzle, which helps loosen anything that's stuck. Scrape again immediately while it's steaming. Repeat this once more.
Fold a paper towel in half three times to create a small, thick pad. Squirt a little more water on the surface and place the folded paper towel under the scraper. Push it across the entire surface to wipe up the remaining water and loosened debris. Repeat with the second paper towel until the surface looks clean.
Squirt a thin coat of canola oil onto the surface. Take the third paper towel, fold it the same way, and use the scraper to wipe the oil across the entire surface in an even coat. You want a thin protective layer, not a pool of oil. If it looks wet or shiny you have too much.
Turn off the griddle and let it cool. Cover it once it's fully cooled.