yep, i used the purple stuff and the oven cleaner. well my whole engine and suspension parts had gunk 1 to 2 inch thick or dirt and grease. 1. i scrape off old gunk with wire brush, flat screw driver ( get in that cracks ). 2. i used oven cleaner, make sure you use the one that does not need to pre-heat oven. 3. spray and let the oven cleaner sit for a while on the part ( wear a mask and gloves) , the longer the better. 4. i used pressure washer to get that gunk off. 5. look at the gunk come off, in some places it took of the paint and took of the rust to bare metal. keep in mind how clean do you need your part.