I was just cleaning the smoker,when I found two spray bottles of Dawn Power scrubber I didn't wven know I had. Took off all the stains off the v tray,that nothing else would touch. Don't know why they stopped making it. :'(
I've never tried Dawn but I know that ZEP Industrial Purple Degreaser works really well for cleaning residue off Bradley components. Only use in a well ventilated area. Home Depot sells it.
(http://www.homedepot.com/catalog/productImages/145/e0/e072796a-fc71-42f1-929c-e8cd0d94bfa2_145.jpg)
They still make it, or maybe a new formula of it, and they may not sell it in your area. The last time I purchased some it was in one on the wholesale clubs. I still have a 30 oz. bottle left. It seems like they changed the formula and they are now calling it Dawn Ultra Platinum Power Clean.
I've been using Zep since I couldn't get Dawn, but It wouldn't touch some stains. Maybe I'll try diluting it less.