Is the steam pipe (steam rod) of the coffee machine getting smaller? Always stuck in traffic. What's going on?

Steam blocking is generally a problem with the use of methods, each time after the milk to wipe clean with a damp cloth, and then open the steam switch to let him automatically block the milk spray clean steam holes. At the same time, the water added to the coffee machine must be steam water or purified water. Do not add mineral water or tap water. The minerals in the water will also cause blockage. I usually use cleaning agents once a week, according to the frequency of your use changes, play more wash frequently faster. I use a semi-automatic so I usually clean the coffee place with a brush every day after coffee, then clean it with a back wash, and then put a cloth into the lock to clean it. The first cup of coffee the next day is usually poured out. This cup of coffee has two purposes: one is to expel the smell of detergent and the other is to see if the thickness of the coffee powder of the day is appropriate.