Seal the floor
An unfinished concrete floor is a porous surface and any unattended oil spills will quickly turn into stains. Sealing the floor provides a permanent solution. First, sweep the floor, and then seal it with diluted PVA adhesive or a proprietary concrete sealer. To finish, apply one or two coats of garage floor paint (non-slip if possible). The heavy-duty gloss paint is impervious to liquids so you’ll always be able to wipe up drips and spills.
Cleaning up concrete
A sealed concrete floor in the garage generally requires minimal maintenance. An annual wash down and a new coat of sealer should do the job. If you’re painting the floor, use an acrylic paint rather than an oil-based masonry paint.