I had some couple year old bottles with old yeasties and whatnot crusted to the bottom. Oxyclean, soap, sanitizer...none of that worked in this instance.
Fight fire with fire, right? I poured a very little bit of beer in the bottoms of each of the perma-crusted bottles and waited about ten minutes. place your thumb over the hole and give it a shake.
All the old crusties were floating in the beer when I poured it out. Some bottles got more shakes than others but I saved all these bottles...then rinse and store upside down, like previously stated...
BTW - the bottles are 500ml Erdinger (bottle carbed) bottles that I brought back(full of beer) from Germany and consumed in 2008....