I don't have a dishwasher. There is just no room for one in my tiny house. So I wash up by hand, which is fine.
Except I am really struggling to wash up my water bottles. After a few months of use, they all seem to develop spots of mould in places that are completely inaccessible round the rim and inside the lip and so on. Is there a good way of keeping them properly clean that I haven't thought of?