In Europe and other places where low flow toilets are common, there’s an expectation that you should have a “cute” toilet brush and toilet brush holder (possibly filled with a mixture of bleach and water). It should not be stored away somewhere inconspicuous around the toilet, but prominently set out for your own use and the use of your guests.
Why, do you ask?
Because it is expected that big stains will be left after every flush, so that you will have to scrub them away after every flush. And then of course you will have to flush again to get rid of what you scrubbed off, and then again to clean the scrub brush….
And so will your guests.
Yay! Saving water!
Here’s a thread talking about it. It also mentions other remedies, like a Rain-X coating inside the bowl, or constructing a “poop deck” of toilet paper inside the bowl.
All I can say is that it’s no wonder we have so much stomach flu going around these days. An outhouse is more sanitary.