856 heavily corroded hubcap removal advice

[FLtractor 146]

Evening, 

My 856.. rear wheels heavily rusted due to calcium chloride, has hub caps on both wheels.. Given the aluminum can’t rust but can corrode.. is it possible they’ve been on there so long with so much rust, upon removal they simply disintegrate? If not.. what’s the recommended way to remove them off the wheels… would like to polish them up? 

Edited 2 hours ago by FLtractor