Mi sono trasferito in un nuovo appartamento. Il forno sembra orribile. Come lo pulisco?

Google the model and see if it has a pyrolysis (German: Pyrolyse) function.

Generic oven cleaner will do the trick. Might need a bit of elbow grease/scrubbing and I recommend wearing proper gloves and having the windows open when you use it as most of them contain a strong acid.

Show us the model of that oven. It might have a self-cleaning mode.

Apart from that how is it possible to rent an apartment which was left like this? In general landlords/ladies charge the tenant and clean it before handing there keys.

Buy any strongly basic oven cleaner (with the “caustic” warning symbol on the package). Wear gloves and open a window so the fumes won’t accumulate. Apply generously, cover with clingfilm (so it won’t dry out) and let it sit for a hour or two. Then vigorously scrub. Repeat if needed.

Generously and repeatedly wipe with a damp cloth (rinsing and wringing out the cloth in between) to remove any residual oven cleaner before using the oven again. You can also turn it on (with the window open) empty to “burn off” the last bits.

Leute, man muss mit einem Backofen Reiniger nicht schrubben 🙂 das geht viel einfacher.

Der Trick: Sprüh den gesamten Ofen ein (außer den Ventilator hinten) und decke es mit Müllbeuteln ab, damit es nicht austrocknet. Lass es 24 Stunden so einwirken. Danach kannst du es ganz einfach mit einem Lappen entfernen, der Ofen ist wie neu. Handschuhe tragen!
Du kannst auch Backbleche so einpacken und 24 Stunden stehen lassen.

Check the manual to see if it has pyrolitic cleaning. If so, then run it. It takes about 3 to 4 hours. This removes hard organic stains. After this you can use any oven cleaning products to clean off the residues.

Had the same issue. I removed all removable parts, washed them separately. I used the Backofenreiniger as mentioned by others several times. There is in the end no better product.

I also use lemon in a water bowl. Just cut several lemon and use the juice of them with 150 to 300 ml of water. Put it in the oven and let it work for 30 min with 150 degrees Umluft. Just wipe afterwards everything, after the oven is not so hot anymore and you can stick your hand inside

For the sticky part I used the Kochfeldschaber. Removes perfectly on even ground everything.

The door can be removed and disassembled until you have both glasses separately. Just wash them both and assembly it again.

The glass can sometimes be really stubborn to clean, but I found a stove scraper works really well for mine.

Oven cleaner and one of them scrapers for a ceran stove.

Bei kleinen Küchen würde ich den Backofen gleich in den Müll werfen und eine Spülmaschine einbauen, wenn es **nicht** vorhanden ist. Ich nutze den Backofen so gut wie nie: Eine Heißluft-Fritteuse ist viel besser.

As others have mentioned, there’s oven cleaner sprays but I’d suggest to try with steam first as it has always worked for me. One time i used oven cleaner on a countertop oven which it wasn’t supposed to be used for, so that was 100% on me, but it damaged the metal parts (only visually, not functionally, but I was really annoyed with myself when I saw it in the manual afterwards 😅).

Now I just fill a bowl or the baking sheet itself with water, add a bit of lemon juice (or vinegar) and set the oven on low heat for a while. The gunk has always softened enough for me to scrape off. Then wiped with a rag, dish soap and water, then one more time with clear water. I find it a lot more comfortable to breathe in the kitchen after this in contrast to using oven cleaner and you probably have everything on hand already, so you might give it a shot. Ovens oftentimes have a low heat setting for exactly this function (e.g. looks like a can pouring a drop). Good luck. And also inform your landlord (at least if the kitchen is part of the rental contract; not sure but I’d guess your landlord might not be responsible if you’ve bought it off the previous tenant but maybe someone else knows more about this)

Scrub with a sponge. What doesn’t come off is polymerized fat, the same stuff cast iron seasoning is made of. Not harmful, not disgusting. It’s not your oven, leave as is. But you can use an acidic cleaner and let is soak. Backofenreiniger makes a foam to let this soak, but some salt and vinegar will do the trick as well.

Remove all oven trays ( keep them separate in the sink)

Spray the entire oven with oven cleaner- it’s a white foam (any supermarket or drug store have them)

Wrap everything with aluminum foil (also supermarket/drug store)

Let it sit for a couple of hours
Repeat the same with the oven trays.

Meanwhile, make a complaint at your landlord/ hand in pictures/ receipts for cleaning utensils

After some hours, remove foil and wash everything with a sponge, until there is no more residue.

Repeat if needed.

Last step when clean: turn on the empty oven on 150-200 degrees for 15-30 minutes, to remove fumes and leftovers from the spray (it stinks a bit, but will get away)