Most consumer IPA is 70% by volume, 90% occasionally found but not common. As noted it is a poor degreaser, but makes a good water remover .
The azeotrope is 87.7% IPA/13.3% water W/W and 91% IPA/9% water V/V so the drugstore bottles labeled 90% are that composition.
Note to fietsbob: There is no "200 proof White Lightning". The most concentrated drinkable ethanol is 95% Ethanol or 190 proof which is the azeotrope. Getting to 200 proof (100% ethanol) requires a ternary distillation or chemical drying, both of which make the resulting alcohol unfit to drink even if diluted below a dangerous concentration. For that matter, 190 proof Ethanol cannot be drunk as is.