I got a few Amstel bottles, oxyclean got nuthin on them. I peeled the labels off, and the adhesive is still sticky. I try to give them to people who dont return my bottles
Weyerbacher are tough too.
I grew up near the Straub brewery in PA, and can get cases of 16oz returnables in a heavy cardboard case for 1.50 from pretty much any beer distributor in the area. I still bottle some 12 ozers for giveaways though.