Enameled dishes at a certain point in time was perhaps everyone in the house. With permanent operation, NAAR and other contaminants are inevitably accumulated. In this case, hard cleaning can damage the coating.
But there is a much simpler and effective way to cope with any pollution. Your chief assistant is a perm, which can be bought in any economic store for a couple of tens of rubles.
Type in a saucepan of cold water a little more than half. Add two tablespoons of porsals.
As soon as the water begins to boil, you can throw towels in the pan, on which there are greasy spots. So you will make two cases at the same time: Clean the dishes and put the towels.
Boil for five minutes. Control the process so that the resulting foam is not overflowing through the edge.
Drain the water. The remaining contaminants are removed with a brush or sponge.
Detailed instructions in the video below.