Here's a little tip for those of you who use your knife to harvest pine or spruce resin, you've all seen just how sticky and difficult to remove it can be, well here's a little in field trick to help you clean your blade
first gather some fresh sloes from a blackthorn
cut a slice from the sloe and use the inside flesh to rub the blade
you'll soon start to notice that the acid in the sloe starts to remove the resin, it may take a little while but persevere
and after about 5 minutes.. a fresh clean blade!