市販の洗剤では、汚れが止まらない

上越市内のお客様です。

三菱の電機温水器で、洗浄機能の付いているモデルです。

数か月前から自動でお湯を入れる時に、汚れが出て来るようになって市販の洗剤を使って洗浄してみたが、汚れがどんどん出て来るようになり、最終的にには、汚れが酷くなりすぎて浴槽にお湯を溜めるのも諦めて、ここ一週間ぐらいはシャワーだけで過ごしていたそうです。

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余りにも汚れが酷いので、市販の洗剤で洗浄しても中途半端に汚れが取れるので、逆に汚れがいつまでも出て来てしまうんです。