I've used oven cleaners....the kind that do not require heat....with no problems. The guy who sharpens my blades claims to have a system for determining the integrity of the carbide and he never commented on my blades. But, because 409 is cheaper, that's what I use now.
BTW, the oven cleaner did remove the "shiny" coating and the red (teflon?) on some of my blades.
'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton
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