I certainly don't claim to be a metallurgist, but just about every washer I've ever seen and used has a stainless steel drum, and you can certainly use bleach with them.
Read the wiki on SCC. Interesting. I'm thinking corrosion of the drum isn't the reason for banning bleach from this machine, though.
Yeah but other things dont make a whole lot of sense. Then again, without knowing the whole reason, who is to say....
In my current job i am doing machine design for a company that makes parts for fillers and cappers. We just got done doing a job that filled bleach bottles. All the product contact parts were made of delrin, neat stuff really. We replaced the parts with titanium parts.