[pyrale]

> What percentage of Bob's customers bother to do that?

Would these people use a cleaner solution anyway? I mean, you can say that of any refilling system, if people don't use it.

[bzzzt]

It's more difficult if you have lots of special containers (in this case with integrated electronics) that can only be sent back to a specific shop.

My dishwasher uses detergent powder which comes in simple plastic containers that can be dealt with via regular plastic waste collection.