Patent ID: 8389418

Claim:
A method comprising: contacting an aluminum-containing substrate with a solution to selectively remove a metal containing coating from the aluminum-containing substrate, the solution comprising in weight % of the solution: 1-20% of at least one acid selected from the group consisting of hydrofluoric acid (HF), hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, and mixtures thereof, 1-10% of at least one ingredient comprising a fluorine ion, wherein the ingredient is selected from the group consisting of ammonium fluoride (NH 4 F), potassium fluoride, sodium fluoride, and mixtures thereof, 50-60% ethylene glycol, and water, forming an aluminum ethoxide layer on an exposed portion of the substrate that is not covered by the coating; wherein said substrate is contacted with the solution for a time sufficient to remove the coating from the substrate with substantially no substrate erosion.