Plain supermarket vinegar, which is usually sold as a 5% solution, kills about 90% of microbes. This is not quite as potent as most synthetic cleaners (which are closer to 99%), but then vinegar is so safe you actually put the stuff on your salad. Plus, it's cheap.
And besides, the aim is not to try to clean our homes to the point of sterility. Natural alternative cleaners are quite good enough - and far preferable - for most household cleaning tasks. So give them a chance - you don't have to shun the conventional harsh cleaners entirely, just use them less.
ratio of 1:1 vinegar to water is fine for general cleaning, or try it
neat for tough dirt like mouldy tile grouting, and on high-bacterial
items like kitchen cutting boards. You can use it to clean practically any surface (except marble, which it may stain).
Pour ¼ cup bicarbonate of soda into the bowl, and sprinkle with vinegar. Leave it to sit for about half an hour, then scrub and flush. (A similar version works as a drain cleaner too.
Voila: your toilet is clean and so is your environmental conscience.
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