We picked up an Yugo SKS at the Richmond show on Saturday. My son & I had talked to the dealer at the Indy show and he spent a lot of time telling my son different things about the guns. He didn't have one at the time but spent time with us anyway. When we saw him at the Richmond show he recognized us & told us he had the gun we were looking for. I was impressed by his great customer service. My son got the orignal book, a 10 mag & 30 mag with it. The gas valve is full of cosmoline. Anyone know the best way to clean it out?