However, if the oil has been cleaned up, I suggest using Richgro 20kg Play Sand. Rub the sand onto the affected area to further remove any surface oil that might still be there. Once you have cleaned it up, use CLR 750ml Oil And Grease Remover. Please follow the instructions carefully at the back of the bottle.
After using the CLR you may also use a pressure washer to remove the stain. Using dishwashing soap and a stiff brush helps with breaking down the oil. - EricL
I recently discovered this simple way to remove stains from my crushed aggregate driveway. I'm not sure what type of stone they are, but the orange stones would 'bleed' and create blotches of small but noticeable brown stains all over the driveway. Here are my tips for removing the stains - the driveway looks much better now!
You'll need some hydrochloric acid and a dropper. It's nasty stuff so be sure to work safely and wear appropriate protective gear. Gloves, mask and safety glasses for me. I pour a small amount into an appropriate, stable container and use the dropper more safely that way. I also ensure it is stored safely and can't be accessed by children etc.
Just a few drops on each stain, and the stain turns to a green colour and begins to run.
Repeat for all stains across the drive - it creates quite an artistic look!
After a few minutes simply hose off well and the driveway is now stain free. Much better! - Kim
I would start off with just hot water and detergent and a stiff brush first. That way you don't do any damage to nearby plants or get any chemicals into the stormwater. - Isobel