boil out of
boil (something) out of (something)
To use boiling water to clean a substance (such as a stain) from an item. Do you know if can you boil grass stains out of cotton?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
boil something out of somethingand boil something out
to remove something from something by boiling. I boiled the wax out of the cloth. You can boil out the stain.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.