[atomicdogs]

This may be an impossible question but I thought this might be a fairly common type of clog. I see this a lot in these kinds of condensers found on Ebay. I purchased this some years ago. Maybe some of you might recognize it instantly and tell me how to dissove it. It appears to be a pretty hard residue.

[biofm]

Try CRL Calcium Lime Rust Remover. Dilute enough solution and soak the condenser overnight.