You wouldn’t ordinarily use your toilet brush for anything but the purpose for which it is kept. Because you’re well aware that the toilet brush is used for just one thing – cleaning the toilet. `
Although it may be quite easy to call a household item “dirty” if it is kept in a place known to host microbes and bacteria, it is worth noting that many household items kept in more ‘honourable’ places are just as bacteria-infested as the toilet brush.