Glass baby bottles?

Si

So my daughter has been using doctor browns baby bottles since she was born. But recently her bottles smell like old formula and soap 😖 No matted how much I wash and scrub and they’re a little discolored and foggy.... I’m over it and hate giving the bottle to my baby without feeling like it’s 100% clean or there’s soap residue. I bought glass bottles today and so far so good but to replace ALL her bottles with glass would be insanely expensive. My question is, could I just repurchase some more plastic bottles or is glass just the better way to go? Any advice welcomed