I did a LOT of record cleaning research back when I was a grad student. Now as a lab director in metagenomics, I have some strict rules on cleanliness of solutions.
I throw out water in clean-rooms after a year. The growth of microbial communities can be seen in less than a month from opening a sterile water bottle.
I would throw out your bottle. Buy a MoFi Super Record Cleaner Wash, and you'll be good to go. DIY is just not worth it overall. I used to make lab grade record cleaner for people on this site 10yr ago. Cost for quality DIY vs MoFi is negligible.