Cleaning the inside of the washing machine is quite difficult. It really has to be done. Some people think that the washing machine does not get dirty, but this is not true. You should look at how you can completely clean the inside of a washing machine again.
Limescale, grease and dirt can settle on the inside of a washing machine. It is therefore good to put soda in the washing machine, for example, so that everything comes loose. Otherwise you can always go over it again with a cloth to see if this cleans everything.