Boiling is one thing that leads to the grease problems to start with when getting the meat off at first... so NEVER boil. Simmer in just hot water is a better way to go.
But you have skulls with grease staining, so yes, just leave em.. you won't see anything to speak of but in the end, there will be a layer of grease at the bottom of the fuel, settled where its supposed to go....
The rest is just like the others say. Better to call around and find 38% Peroxide in bottles locally.. its not cheap and the shipping will be haz mat so local pickup would be better... search chemical supply companies..
If you need more info, PM me. No big deal.
If you use hair bleach or the paste mentioned ,you may have to do it a couple of times... its heat activated to an extent hence the use of a heat lamp or out in hot sun.... rinse off, do it again up to 3 times, then let dry really well in the direct sun or heat lamp and see what you have.
OTOH regular peroxide from wally world, my buddy has used it before.... just takes days instead of hours to whiten....
