For those of you who don't really know what fiddleheads are, they are the Ostrich Fern. You can identify them by the deep notched stem that is very similar to a common celery stock.
They also have a papery brown coating on them when they are still close to the ground:
The easiest way we have found to clean them is to put them in a wire mesh cage when dry and shake them like crazy to get off as much of the brown stuff as possible.
Then hose them down really good with decent pressure. (see all the brown junk on the ground-eeew) It is easier if you do small batches when rinsing. Don't use high pressure or you will blow them to bits.
This is one patch that is already past picking, but hop down an island.......
and they aren't ready yet! (next week these will be beauties!)