Does Garage Floor Stain Remover Work?

For some garage floor finishes, yes. Although I haven't used many, the general consensus is not good for most garage floor stain removers. Most anyone will tell you that they only sometimes work, and none of them work on everything. Even the ones that do the best job usually leave a lightly colored stain in your concrete garage floor, and I, personally, don't feel like that's worth it. You can usually pick up a small bottle of the stuff for about ten dollars, but if you have a really big oil spill, you might need to aim larger.