Soak the stain with white spirit and scrub with a hot detergent and water. Finally rinse thoroughly with clean water. Solvents should not be used on stains that are less than a week old, as this will increase penetration into the concrete.
Really just some things that spring to mind to try - not tested - but you could try a sample area first.
sugar soap
detergent
or even bleach depending on the colour and what sort of stone / concrete your patio is made of
Tony V
give it a good soaking in water, then put some gloves on a pour a small bit of sharp sand over some of the spots. just rub the sharp sand over the areas with your hand and it should lift it.
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