It's hard to find sand here near Scranton Pa. So I cleaned these two with some fine gravel from the driveway and dish soap. It worked pretty well. The Smuck & Co. had a lot of black inside.
i usually use fine gravel mixed with a few bb's,if the mouthes big enough,i get a piece of kintchen sponge and tape it to a slightly curved stick and scrub the inside good[]
Just buy yourself a bag of aquarium gravel. Its made from resin and cleans bottles with no side affects. Last just about for ever too. I've been using it for decades.