Seven easy steps to keep your Planchetta for life:
Remove the solid food remains.
Poor a cup of hot water and let it soak for a few minutes.
Wash with water and detergent. You can use a metal spatula and a sponge. Allow it to dry very well (you may even heat it for a few seconds)
Apply a thin layer of cooking oil with paper.
Store it well-oiled this way it will be ready for the next use. SAFETY ADVICE
Do not use lemon or vinegar, this may damage de surface. Keep children away from the Planchetta
Use oven gloves to protect yourself and grab the griddle by using the handle. Cook over low to moderate heat.

You should avoid using lemon or vinegar because, it could damage the surface.

Yes, you can use with no problem, if you do it softly.

The Planchetta can be use to cook over any surface.

The stains are totally normal, there are a characteristics of the material. The Planchetta is made with a rustic material who not have any treatment. Once it cured, and with use, the stains will disappear.

Is better to heat the Planchetta for a few minutes first, and then cook the food at minimum fire because the iron heats a lot, be careful not to burn yourself!