I don't understand the positive reviews. I bought it to clean my glasses. I use normal tap water and the maximum time of 480 seconds. The glasses are just as dirty as before. Am I doing something wrong?

Question

I don't understand the positive reviews.  I bought it to clean my glasses. I use normal tap water and the maximum time of 480 seconds. The glasses are just as dirty as before. Am I doing something wrong?

Accepted Answer

I add a squirt of this cleaner and then 90 - 180 seconds is usually enough.

[Bio-chem ultrasonic cleaner](https://www.galaxus.ch/de/s2/product/bio-chem-ultraschallreiniger-ultraschallreiniger-22513999)

Answer

I can only confirm that greasy soiling cannot dissolve without a small splash of washing-up liquid.

Answer

I add a splash of washing-up liquid.

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Question about Grundig Uc 6620

I don't understand the positive reviews. I bought it to clean my glasses. I use normal tap water and the maximum time of 480 seconds. The glasses are just as dirty as before. Am I doing something wrong?