I'm in the process of pulling my old WBX (putting in a Boston Bob engine)
and I'd like to clean the bits that I'll be resinstallling.  The
alternator got greasy from a rotted through rubber hose that went from the
oil breather "tower" back to the air intake.

Should I use a little gasoline and brush - or maybe some ozone-depleting
freon?

TIA,

bem