the bolt can be tough to get all of the cosmoline out, a good way is to boil it in water- the cosmoline will melt and float to the top, leaving bare metal.
PS only do this to cheap guns caus eyou cant SCREW up a good AR-15 that way....... trust me
Change that to 'only do this with a durable gun like a AK-47 or SKS because a AR-15 can't take that much abuse'
