You’ll need:
1/2 litre of hot water
1 glass of white vinegar
1/2 Glass backspray
What to do:
Bring half a liter of water to the boil, and before it starts boiling, add the white vinegar and mix well.
During cooking, mix the sodium bicarbonate in the oven you wish to clean.
Remove the mixture of vinegar and water from the fire and pour it into the sink to mix with the baking soda.
There is an immediate ebullated reaction. Try to close the inlet of the pipes with a cap. This will prevent water from falling on it for at least one hour.
Or if possible, let it work all night and repeat the trick at least once a week.