To za wikipedią:


Removing powder coating

Methylene chloride is generally effective at removing powder coating,
however most other organic solvents (acetone, thinners, etc.) are
completely ineffective. Most recently the suspected human carcinogen
methylene chloride is being replaced by benzyl alcohol with great
success. Powder coating can also be removed with abrasive blasting.
98% sulfuric acid commercial grade also removes powder coating film.
[citation needed] Certain low grade powder coats can be removed with
steel wool, though this might be a more labor-intensive process than
desired.