The o-ring is susceptible to breakage. I’m not 100% sure, but I think Vaseline and other oils can degrade some O-rings. I lubricated the adaptor on one of my tubes with Vaseline and the o-ring was destroyed in just a few days.
I bought a generic pack of o-rings in many sizes for a few dollars at harbor freight.
As for cleaning it, you can use a bottle scrubber and dish washing detergent, or that’s what I do when I use an oil based lube. I haven’t noticed any rust.
I switched to a glycerin based lube quite a while ago and cleaning just involves running water inside, swishing it around, and dumping it out a few times.
Sigmoid’s hygienic carrier lube
The stickers do peel off in time, you can tape them in place, but eventually the numbers on the stickers wear off as well. I’m thinking about etching numbers into my tubes soon.
Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")
Current: 9.0"bplx6.125" 2020
Goal: 11.5"bplx7" 2021.