I used diluted muriatic acid. Not for the faint of heart... stay downwind.

TSP, Tri Sodium Phosphate, may work also. Can be found in the big box stores.

I would never live in CA!

Here the first step would be power washing, but not in drought territory. Wonder if you could do a poultice to draw up the oil like you would on stone and scrape it off so you use minimal water? A solution of chlorine bleach in a spray bottle might take care of the leaf stains. Protect your skin and try not to breathe it in.

You might try spreading kitty litter on the oil stain. It may soak some of it up. There also products available for just this situation. A google search will turn them up.

I think the stain from son's truck is radiator fluid.

TSP was my painter father's favorite. Didn't know I can't buy it in CA. How strange.

I tried using the kitty litter... didn't do a thing.

I will try the bleach before the muriatic acid.

Thanks all for your ideas. (It really does look awful)

Why not talk to the folks at a paint store? They might be able to recommend an oil based concrete stain that will cover both your problem areas. You'd have to stain the whole driveway but it will look like a million bucks. OK, maybe not a million.

I am in Sacramento, and I just checked: my Home Depot store sells both powdered and liquid TSP. (And yes, I checked, my location was a California store).

You can rent a power washer at Home Depot, Lowes. Try dish detergent, stiff broom, and power washer.

Once again.... Thank you for your ideas!