Types. The selector switch and the knobs differ from one machine to another. The washing machine can operate only with the help of the timer. Timer is generally known as the start button for the washing machine. The digital version is controlled digitally with the help of an electronic switch. Mechanical type is defined as the one fixed automatically. Digital one is a recent invention and many of the new brands have them these days. But a mechanical version is considered as the best and it helps in controlling the time for washing the clothes manually. The former is operated with the help of electronics, which basically means it's connected to electrical wires. The latter is connected to the wires of the machine and they are operated manually.
It is therefore essential for a consumer to maintain the washing machine whether it is old or new. Remember that washing machine has many moving parts as can be seen. Moving parts will cause wear and tear. Similarly the temperature of water also causes impacts on the parts of the machine. Detergents, bleaches and softeners used for washing have acid contents which will react with certain parts of the machine especially metallic parts. Residues formed after the washing process may get deposited in different places in the interiors of the machine.