Cleaning grill for pesach

I have a wood pellet grill/smoker.  The max temp it can reach is 465F.  I’m getting new grates for it for pesach.  Is running it at 465F good enough to kasher the walls?  We do use chametz in the grill during the year.

Great Value Hash Browns

Potatoes, disodium dihydrogen pyrophosphate, dextrose Says “may contain traces of milk, eggs, wheat, and soy.” Should I be concerned about this for Pesach? Is dextrose ever a problem? What about inulin? Thank...

hemp milk

Water, Hulled Hemp Seed, Contains 1% Or Less Of: Disodium Phosphate, Gellan Gum, Natural Vanilla Flavor With Other Natural Flavors, Tricalcium Phosphate, Vitamin D2, Xanthan Gum

Silk creamer sweet and creamy

Almondmilk(filtered water, almonds),Cane sugar, almond oil, sunflower oil, sunflower lechitin, dipotassium phosphate, natural flavors, pea protein, baking soda, sea salt, vitamin C(stabilizer), glean gum