You could try scouring powder and washing up liquid, rubbed neat into the
hands, removed most things
which stain. And then washed off.
Or you could try,
"Swarfega" Original Gel Rapid Hand Cleaner.

Stephen SG

"Clemens" > wrote in message
...
|I was picking and halving walnuts, and my hands got dark brown from
| tannin in walnut's shell.
|
| Please, is there any effective agent to remove dark stains off the
| hands ?
|
| I tried with acetone, alcohol, lighter fuel, paint thiner, windex,
| washing soap, laundry detergent, but it didn't help.
|
| Thank you.