Glass==Easy to clean, non-permeable surface. Soak it good, get a scrub brush in there if you need to, then rinse in hot water, then sanitize.
Clean with PBW and brush, run thru the dishwasher and heat dry, then sanitize them. That's what I did with my first bottles that had been sitting in a basement for 10 yrs or so. All kinds of nasty stuff in there.