Air Florida in the Potomac was engine icing not airfoil contamination. Crew set EPR but failed to cross check N1 and the rest is history.
Let's not forget the deicing crew used different rigs with very different fluids fluids on either side. Additionally the crew exceeded their holdover time and didn't go back to deice because they didn't want to be late. They then sat behind a DC9 in an attempt to deice themselves which caused clear ice to form on the wings and nose.