Well, traditionally you could heat up the blade (low heat) and apply vinegar and lime (or lemon) juice on the blade, then wiping it off. You could also use a quicker (but needing more care) with Radio Shack etchant (1/4 acid - 3/4 distilled water). If you use the latter, rinse off the stuff and rub with baking soda to neutralize the acid.
|