Why clean a plug...easy. I also have some American made cars...I am old school. Also, all of my real tools are American made. I have a Master Mechanic Set by Craftsman I got back in 92'. I have just sold off a bunch of Snap-On other brands from my dad's machine shop. The HF aluminum jack looks like a good buy for a home user. And, I think that 90% is understated...I haven't seen Made In USA at all. We went from an manufacturing country to a retail country...I wonder what Dip Stick thought that was a good idea.