removing oil stains?

[crashe]

Hey guys will any of these ideas work on really old oil stains...
The floor of my garage I call it "Ewing Oil" (as in Dallas)

Someone did a oil change in there and spilt the oil everywhere...
Garage floor reasonably smoothish.
Driveway, has been waterblasted.. lifted some but not all.

I also have some down my driveway.... under my car.

[froggyfrenchman]

I think I'm dead and only exist in cyberspace - apart from getting many lungsfull of zinc fumes from welding....we used to clean our workshop floor when I was an apprentice with caustic soda,just sprinkle it on,wet it down and scrub in with the broom,then wash off with the fire hose.It ate our nice smooth floor and made it rough.

What a man!

[Ixion]

Hey come on guys,the stuff you buy from the local dairy Co' isn't full strength.
The stuff my Mrs uses for soap making is but,an yes you don't mess with that.I used to use dairy Co' caustic for scubing down cow sheds,it takes your finger prints off after about 1/2 an hour but it's pretty mild compered to the real thing.

Ah, the stuff I've used was pure NaOH. Sodium Hydroxide Pearl.

[googles]. Hm, appears that dairy cleaners for CIP are 1% strength. So , yeah, it's not full strength. Still would recommend gloveses though.

[MacD]

Ah, the stuff I've used was pure NaOH. Sodium Hydroxide Pearl.

Hmmm, me too. Good for dissolving flesh off bones.

[ManDownUnder]

Hmmm, me too. Good for dissolving flesh off bones.

Like a spray on weight loss program? Might hurt but then I've seen crazier things???

[texmo]

Drain cleaner from you supermarket usally works a treat.