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The cardinal rule: no soap on a seasoned griddle. Dish soap strips the polymerised oil layer that makes the surface non-stick and rust-resistant. Soap is only for a bare griddle you're about to re-season from scratch.
Step 5 is the one people skip, and it's what prevents rust.
Deep cleaning (a few times a year, or after a long storage period):
Removing rust. Rust on a Blackstone is normal after rain or neglect and is entirely fixable:
Don't be timid here. You're allowed to take it back to bare steel; that's what seasoning is for.
How to season a Blackstone griddle — nearly as commonly asked as cleaning, and the two go together:
The griddle should end up deep black and glossy. This takes a couple of hours the first time.
| Oil | Smoke point | Good for seasoning? |
|---|---|---|
| Flaxseed oil | 225°F | Hardest finish, but can flake |
| Avocado oil | 520°F | Excellent all-round choice |
| Grapeseed oil | 420°F | Very good |
| Canola / vegetable | 400°F | Fine and cheap |
| Blackstone conditioner | — | Purpose-made blend, works well |
| Olive oil | 375°F | Not ideal — low smoke point |
Storage matters more than people expect. Most rust problems come from moisture, so oil the surface before storing, use a hard cover plus a weather cover if the griddle lives outdoors, and empty the grease trap so it doesn't attract pests. If you can, keep it in a garage or shed over winter.
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