Burning off takes 5 minutes.
You don’t have to do it after grilling, but before the next grilling session.
Until then, the gunk stays under the dome and takes on wondrous shapes. No matter, 400 degrees kills everything. After that, only carbon remains, which is brushed off. The fun continues.
I admit, many have difficulties with this because it doesn’t seem hygienic.
Also a good reason why I would never use stainless steel grates, because the (visual) expectation is always that it shines. That also explains all the cleaning products, even from well-known manufacturers. The €1500 sparkly thing is supposed to be maintained so visitors are impressed.
Wrong.
We’re talking about grills here.
As the saying goes: This is a "grill" and not a "cleaning tool."
Or is this whole thing meant to be an environmental discussion? A 5kg gas bottle lasts easily 10 hours at full power. Of course, depending on the model. You can spin a lot of roosters until it’s all gone. Cost about €8-9 for a gas refill. Someone else can calculate the CO2. But it’s negligible.