I'm in love with Grez Off!  Like another reviewer  here,  I use it for many tasks!  It does more than dissolve grease!I especially love it for removing grease spots from laundry.  We love to cook and I am forever in battle with stubborn grease spots on shirts.  It does not discolor clothes.My makeup bag seems to always turn into a mess with hard to remove eyeliner pencil gunk getting all over my tubes and bottles of makeup.  I use a dry terry cloth and spray a little Grez Off on each container such as mascara,  mineral makeup,..etc.  then wipe.  The Grez Off takes it right off and cleans the inside of the bag when nothing else will!  If you are a lady and use makeup,  you know how troublesome it can be to clean your makeup bag and wipe your makeup containers clean.  (unless you are a super neat nick and they never get grimy)I use it to clean out my bathtub also.  It's strong and I wear a face mask...but boy does it do the trick,  and does it fast!  Much easier than using scouring powder or spray bathroom cleaners such as Dow.  This product seems to just melt the scum off and leaves the tub really shiny with little effort from me.  So really it's more than just a degreaser!I haven't made it out to the garage yet to try it on oil spots,  but watching the video that a gentleman posted in his review,  it's plain to see that he did not leave the product on the concrete nearly long enough to reach the soaked in oil.When I get around to using it on concrete oil spots,  I will spray the spot,  cover it with plastic so it doesn't dry,  and let it sit overnight or so before I attempt to scrub and rinse.  I have faith that it will do just as great a job on those tuff garage floor spots if given time!  It cuts through grease like lightening but concrete grease soaks way down,  so my guess is it just needs more time and maybe that's why some people aren't seeing the results that they could have.The price of this product is also very economical compared to other products,  especially when purchased in the 12 pack that Amazon offers.