Not cleaned my car for at least 2 months, it was full of general winter road grime, filthy

Anyway, washed it today in the nice weather, but there are two stains down the bumper at each end of where the front edge of the bonnet sits, its come from water and grime dribbling down off the bonnet onto the bumper and beyond.

The wash and a bit of extra scrubbage didnt shift it, it actually looks like the sort of stain you get under black rubber window seals.

Anyone know a good grime remover, something which I may have around the house/shed?

Yeah, I know there are paint peelings!! concentrate on the stain please!!

auto glym intensive tar remover.

im having a break atm, im in the middle of my mid winter big clean and i had marks like these from my door handles, i also had black crud all over the side skirts and intensive tar remover shifted them all with ease, ive also just clayed the car and thats removed some of what the auto glym couldnt.

just having a cup of tea then im back out there to polish, polish wheels, and wax her a few times

I recommend AG Intensive Tar Remover think it comes in a 325ml with a blue label.
If not try some AG Paint Renovator which will be slightly abrasive to remove that stain.