Any thoughts on how to get these rocks that are rusted onto this off or if it should be cleaned at all?

[cowsgomoo]

I tried vinegar overnight and it loosened it all up. I took a bamboo chopstick and started to force it off and then the lid just broke apart into big pieces.

Thank you all for your help!

 

[Thetf2jack]

Your reply to this question is exactly what I was just going to ask! I'll ask it nonetheless. Should I keep the rusted lids on any old bottles I find? Does it detract or add the value if you do or do not remove the rusted lid?

I like taking the kids off to see what substances are left in the jars

 

[Dave in Waukegan]

I find that water is a good solvent for rust. Try soaking and allow it to dry. Repeat. Light scrubbing will remove much of the concretions.
Might try CLR.

 

[greenbay1108]

vingar and coke a cola will work on the rust