Oven Cleaner - a few years ago Charles Freud of the company of the same name, STRONGLY recommended not using oven cleaner, since it attacked the brazing that holds the carbides onto the bit of blade.
The original simple green was pretty strong stuff - for example, the FAA did not allow it's use on airplanes in any manner. Then they came out with Simple Green Extreme which, despite the name, was a milder version that did not attack airplanes or woodworking tools. When I ran out of the Simple Green Extreme concentrate, I found that it had been replaced by "plain" Simple Green. So unless you have a very old bottle of concentrate, Simple Green is probably okay. It is one of the options that I use on blades and bits.