Rating:

I use 432 for my stainless parts that come back with 4 years of 365 days of hot gooy grease. We razor blade scrape what we can (sometimes 3/16" thick) then soak for 1 hour in a 10 or 15:1 solution. They come out shining with maybe a few chuncks to knock off the crannies. It screws up aluminum and requires safe handeling but I love it!