No one will argue that washing cast iron batteries from dust and various stains is not as easy as it might seem at first glance.
It is not difficult to wipe the "ribs" from the outside with a napkin.
But inside, where pollution usually accumulates, one rag cannot be used here - "heavy artillery" is needed.
To begin with, place a basin or an unnecessary tray under the battery. You can spread out an old terry towel or use sanitary diapers.
In addition, you will need a spray bottle.
Fill it with soapy water and spray the soapy water on the battery. Then take the brush you normally use for painting batteries and brush away the dirt.
Due to the fact that such a brush has a curved handle, it will be possible to do this without problems.
A rag for baby bottles (old, of course) or a new rag for cleaning the toilet bowl will help replace the "accessory" needed for cleaning.