I absolutely hate using bottle brushes. They suck to get inside of bottles, they always deform quickly, and they spray water as the bristles exit the bottle. They also just don’t work well to get the little bits of yeast stuck in the bottom of the bottles. Fancy and expensive machines built to blast water inside your bottles and clean them quickly do exist.
Following the procedure I outline below, you should be able to get your beer bottles clean with relative ease, and minimal (almost no) use of terrible bottle brushes.