Do not clean more than simple tap water!

I clean for a few months my 4 bottles with tap water. I never used soap, only rinsed with hot water and then with cold water. They have always been nickel without any odor. But on one of my bottles I noticed a small spot on the bottom side because I had not cleaned the bottle after 10 days, I decided to buy these tablets.

I used one: it did nothing.
A second leaving longer as indicated in the instructions: still nothing, just a not very pleasant smell.
Two tablets instead of one: always the same.

Appraisal: save your money to buy syrups and rinse your bottles with water, the product was on the market only increase the profits of that company trying to sell you a product you have not needs.