To quickly clean your heater, you only need two ingredients and a few containers, such as Tupperware.
The ingredients needed for cleaning are: detergent and water. Simply mix a detergent of your choice with water in a container. The important thing here is to consider the size of the container. The selected container must hold enough water to clean the heater, otherwise you will have to mix it up again and again. Now place other containers, such as Tupperware, on the floor under the heater. These simply catch the water later. Now pour the water mixed with detergent slowly over the heater. The water now removes the dirt from your heater and then flows into the containers lying on the floor.