Here's the next best thing: soak the toilet, sink and shower head with equal parts vinegar and water. (thefashionablehousewife.com)
Note: I don't follow the usual oil and vinegar ratio of 3 parts oil to 1 part vinegar in my measurements as I prefer a tart dressing and therefore less oil. (freshncrunchy.net)
For a nice marinade, mix equal parts vinegar and olive oil, a splash of beer (optional) and 1 - 2 tbsp. (firehousechilli.com)