How to remove old oil stains from concrete?

Ready2go

A client had an accident with cooking oil in their alfresco area. They have moved out but there is a big stain left on the exposed aggregate concrete. it has been there for 6 months now and I need a solution to remove it. I have a pressure washer and tried that a couple of months ago along with some concrete cleaner. Does anyone know a solution here? I'm tempted to just put more oil around the whole area to make it even!

Jewelleryrescue

Hi @Ready2go

Smart thinking about adding  more oil  to try blend the stain,  But that carries some risks risks of a further blotchy  finish. Test that theory in a less noticable area. or add a  little oil to stain and feather it out lighter and lighter,in a small radius.

But  first lets try one more trick no promises  though. Car  engine degresser is what i used to use on drive way oil stains brushed  on to stain and scrubbed  with  pressure washer clean up  next day. 

 Exposed  aggregate you mean  like pebble crete?  If so sanding back some concrete is out as on polished concrete. So whats  left ummmm

try some bleach in the centre of the stain only  undiluted and leave it see if it helps lighten that area, This  can lead to and over clean spot just as  bad as a dark spot so the whole area will need same treatment. 

If the aggregate is like pebble crete rough textured  surface consider mixing cement (No sand) into a  thin paste and recovering the patio area fully and lightly spraying water on aggregate to re expose it with a  fresh uniform concrete under color. This will need  sealing again.

Good luck on your problem solving I hope one of these helps.