I just pressure washed my own driveway - what a pain in the @ss that is . Engine oil stains on the drive , poured a bottle of cheep coke on it and scrubbed- no joy. Sprayed wd40 on it , let it soak and then scrubbed with boiling hot water - no joy. Then sprayed oven cleaner on it and scrubbed- no joy , engine oil still there . So got me karcher out and just pressure washed it . So glad I only have to do this once a year 😅