Before and after cleaning it with Blackstone griddle cleaning tools, degreaser, and Carbon Cure degreaser foam.

Can you tell if the "steel" in that griddle plate is ½-inch carbon steel or ½-inch stainless steel? Carbon steel can be polished and would have have to be seasoned rather than left shiny.

It would be best to have not used those on that griddle. Bricking or similar w/ oil would have been much better. At this point:

Wipe off as much of anything as you can with a damp cloth.

Do 2 or 3 hot/cold cycles: 400°f for 15 minutes, cool for a couple of hours to burn off as much of the chemicals as you can.

Then brick it: heat to 350, pour a bit of oil on, scrub lightly w/ a brick or pad, clean off the residue.

Season with oil but make sure to wipe off all excess oil.

More: https://bamasotan.us/griddle-faq/

Thank you everyone! @jwvideo I am not sure if it' carbon steel or stainless -- I tried calling customer service again to see if they could tell me. It doesn't look shiny like I would expect stainless to look (and checking out some stainless griddle images)-- maybe it looks something like this carbon steel griddle. If it is carbon steel, how would I go about polishing it? This is a sanding/smoothing/oiling process I was thinking of trying.

@opaone thank you! I did originally brick with oil and it didn't make much difference on the raised black burned patches. Yikes, I hope the chemicals aren't too bad! The first product from Blackstone said nontoxic on it, and the Carbon Cure was recommended to me by the stove manufacturer and can be used on cookware as well so I hope it is not too bad. I will try what you suggested. I already wiped it off with a cloth when I did it, but it looks like there are little pock marks/scratches where the product is lodged. That is part of why I was thinking about sanding it a bit (video link in first paragraph).

@lucky998877 -- great idea! Thank you! We could use a little more surface space, so I will look for a cutting board that will fit the spot.

Since your griddle "doesn't look shiny", it more-than-likely is carbon steel (sometimes also called "cold rolled steel" in product literature, IIRC). You could try what is in the video you linked but it's probably best to try what opaone suggested first. Check his link if you haven't already done so.

Steel griddles need to be seasoned and the process is pretty much the same process as seasoning cast iron woks and fry pans and carbon steel woks and fry pans.