La Cornue Grand-Maman 90 Manuel D'utilisation page 73

If wiping is not sufficient, wash the plate with washing-up liquid and a "Scotchbrite" pad.
Preheating should be done with a moderate heat: excessively hot preheating is
impractical, as cast aluminium has special heat transmission properties. What's
more, it makes cleaning much easier.
The plate can be cleaned with abrasive sponges, a wire brush or stainless steel ball pads.
If desired, you may let a natural patina gradually form on your plate. In this case, cleaning
with washing-up liquid and a "Scotchbrite" pad are sufficient.
The barbecue grill
Once you have finished cooking, keep the burner on maximum (or leave the element on, in
the case of an electric grill) for 5 minutes: all the fat that has dropped onto the stones will
start to disintegrate, forming dust-like particles, which will drop into the drip tray.
To avoid the need to clean your drip tray, simply line it with a folded piece of aluminium foil,
before cooking. After the grill has cooled down, simply remove the foil: the drawer is impec-
cably clean.
If bits of meat or fish skin remain on the grill, wipe them off with a "Scotchbrite" pad, or
remove them with a wire brush.
Every 2 to 3 months, depending on frequency of use, we recommend soaking the rocks over-
night in warm water and soda, a mild detergent, or a special high-strength cleaning liquid.
The ceramic hobs - radiant elements and induction
A number of products can be used to protect your hob from greasy stains and any damage
caused by sweet foodstuff spills.
These products, which form a shiny protective film, must be applied before the hob is used
for the first time.
Your cooking surface, whether warm or cold, should be cleaned on a regular basis, to avoid
any build-up of stains and grease.
Light stains can be removed with a damp cloth.
Stubborn stains are easily removed with a razor blade.
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