I buy it by the case at the $1 store.
I would recommend it for grease, I have used it in carpet cleaning for really bad restaurant carpet.
if you plan to use it for house cleaning, be sure to property dilute it. a little of this stuff goes a long ways.
wear rubber gloves for sure, april 1979 is right about the ph, it gives your hands that slippery feel if you handle it.
a great tool for the toolbox