I use Bormioli Rocco glass bottles to store water and fruit juice.
The problem with the juice bottles is that pulp residues dries on the inside of the bottle. How can I clean the bottles?
I have tried CLR (calcium lime rust) remover which is basically a powerful acid and that does not work. Suggestions like "put rice in the bottle" and stuff like that are useless. I mean I have tried ACID ok and the stuff is not coming off. Maybe I need to try raw lye? My concern with using an alkaline chemical like lye (sodium hydroxide) is that it might dissolve the glass.
I have considered trying piranha solution, a powerful and dangerous mixture used by organic chemists to clean glassware, but it requires access to sulfuric acid and highly concentrated hydrogren peroxide which are difficult to get.