Ive been washing them off with some water before I toss them in with my noto's and paddletail newts. Both these newts love flie maggots. I've been catching catfish and tossing them in the woods where I fish. About 50 yards away so I don't smell them. When I return the next week they are full of maggots that I just toss in a jar. I was thinking of feeding them moist shrimp pellets with some rep cal in it but right now I just use them as is. Full of good fish fats and vitamins. Some of my other salamanders have been eating them also. Turns out this is the easiest free food I have come across. You can culture these very easy. All you would need is to get some ground meat, mixed with some rep cal or other vitamins and place it in a an old large mayo jar. Leave the lid off let flies land on it for a dayor two . Add a 4 table spoons of water, Place the lid back on with alot of tiny pins holes and place in a shady spot far away from the house. The smell will be bad but you get about 300-500 maggots to feed to your animals!!!!