Hello, guys! This is my first post around here, and, although I read the rules, I apologize if this doesn't quite suit this subreddit.

So, I've been storing empty beer bottles for a little while now as a sort of personal collection. However, a few months after I started, I realized that the rests of beer inside those bottles could lead to mold and stuff. I decided to wash my bottles to prevent that from happening, but I guess I was a little too late.

It is nothing that horrendous, as I have just a few bottles and they have only small moldy islands in the bottom, but I guess it could be nicer if those guys were not over there. It seems that simply filling them with water and shaking doesn't does the job, so I guessed I should ask someone with more experience hahaha.

Thanks in advance.