Reuse bottles?

Sara

I breastfed with my first, and intend to with this one, as well. But, once he starts daycare, I’ll have to send my milk in bottles. I still have all of my daughter’s old bottles. It’s been about a year and a half since she’s used them. Would you reuse them for baby two or buy new? I’m not sure if bottles get weird after being stored away for a while. They look ok.