Oh well, I'll throw this out again and get flamed by the boiling water and/or Bleach users, but I have a thick hide.
I have been brewing for about 4 years now. I have never had an infected fermenter, but I have had infected bottles. I clocked these up a poor sanitiser that I was using. I dont' really remember what it was, as I threw it away the day I first tried Star San. Star Sn costs a few bucks, but it lasts forever.. and I mean a REALLY long time. 1 oz makes 19 litres of sanitising solution, and 32 ounces costs $35, so about a dollar to make a full keg of sanitiser. this lasts me MANY brews I have only used like 1/2 of my bottle of Star San and I have brewed thousands of litres of beer.
OK, so here's where it gets hairy. I NEVER use any detergents in my fermenters. maybe once a year I do a soak with boiling water, but only to activate some PBW to dissolve Beer Stone in them. when I finish a batch, I use the hose and a scotchbrite pad and get it looking spotless, but no soaps or cleansers. I dry them out and put the lids on and leave them until it's time to use them. When I need to use them, I spray the tap, sediment reducer and the tap hole in the fermenter with star san solution, screw the tap in, then put maybe 100-150ml of star san solution in the fermenter, put the lid on an swirl it all around, so all parts inside the fermenter get splashed. That it. Never done anything else, it's cheap, it's instant, and it's foolproof. Why use bleach and hot water and wait.. then rinse (with non sanitised water..... um ok) to get rid of the bleach? Trust me, the .001 of star san used (cheaper than bleach) is a better sanitiser, and it's NO rinse. If you leave it all in the fermenter, it actually acts as a yeast nutrient and has NO flavour. But I do pour out the excess.
A simple quick spray and about 30 seconds, and EVERYTHING is dead on spoons, thermometers, cups etc. Seriously it kills all bacteria within a few seconds, but is 100% safe and doesn't need to be rinsed. I really cannot think of any reason that anyone would use anything else. Just buy some and use it... you will never look back.
OK, so every once in a while, the water hose won't get all the crap out of a used keg, so I use a small bit of Napi San, rinse it well and use star san. The process I covered for fermenters is almost exacly the same for kegs. When empty, I clean with the garden hose and rinse well )including down the beer out tube). THen i add 100- 150 ml of star san solution, put the cap on, add C02 and shake it to cover everything inside, then run the sanitiser out the beer out tube, leaving C02 in the keg. I leave these for months, and when I need use one, I know it sanitised and full of C02.I just release the pressure, take the top off and fill with beer.
Star San. Get some Never ever worry about an infection again as long as you get it wet and leave it for a minute or two. No more bleach to rinse off ( with non sanitised water) no more water to boil and hopefully not burn yourself with, and no more infections.
http://www.craftbrewer.com.au/shop/details.asp?PID=933
OK, flame suit on.