Backflushing: Why shouldn't I use household cleaners for backflushing?

"Several big reasons:
  • Undissolved detergent can make your espresso taste less than desirable. In addition, the undissolved granules can cause the solenoid valve to jam open or not close completely. Espresso cleaner are especially designed to dissolve completely and leave no residues.
  • The detergent must be gentle enough so as not to harm the soft metals or rubber components inside the group and solenoid valve. A harsh detergent could ruin valve seats, or worse yet attack the group's metal. Espresso cleaner is especially formulated to gently clean the interior of your machine.
  • Use of inappropriate cleaners or improper use of recommend cleaners may damage your machine; these repairs are not covered under warranty.

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