I brewed my first batch 1.5 weeks ago and in anticipation of bottling in the next week, I bought my first two cases of bottles. I quickly found that the "bottle brush" that came in my brewing kit doesn't even fit inside the mouth of the bottles. Not a big deal for these new bottles, just a quick cleaning with PBW and a rinse, then sanitation on bottling day, but I also need to find a brush to clean them once they've actually been used.