New and improved?
(original  review)- This stuff works awesome!  I was trying to clean brown varnish from engine parts, I wasted numerous cans of brake clean, carb cleaner, acetone, lacquer thinner all to no avail.  Just for the heck of it I hit the parts with this stuff in a spray bottle, and voila! Instant results!  And it works on aluminum too- just use cold water and work fast.  (Hot water will etch aluminum parts.)  This works like oil based solvent from the good old days! I even cleaned my engine bay to look like new using this.  Pressure washer not needed. Mixed 4:1.  Best money I ever spent!<br /><br />UPDATE:<br /><br />I ordered this again 6 months later, and noticed the bottle now says "new and improved".  At first I thought wow, they made it even better.  I couldn't be more wrong.  They must have taken an important ingredient out for whatever reason.  It no longer works as well as it did the first time I used it and I even diluted it 50/50 this time.  Therefore, I had to remove 2 stars as it only takes the oil away now and not the sludge.
Rating: 3 stars