Dishwasher? ?? Whats that?? Way out of my tech league. I still was dishes by hand.
By mild I mean a drop or two of Dawn in a small cup of warm water. dip in with a lint free cloth and clean away. Wipe down with some warm water and dry it really well.
Bingo, clean roller.
No soap on heads, just rubber
And, yes, I prefer doing dishes manually too. It takes about the same time to stash them in the machine as to wash them.
I don't use any kind of solvents on my pinch rollers...just water, and the minute amounts of tape oxide deposits comes off very easily, so not sure what problems you have...but then, I use good tape to start. I'm not understanding why some people have that much oxide deposits that they need to use more involved cleaning methods. Either they are using crap/old/deteriorating tape...or they clean their rollers once a year after heavy use, and wonder why it's so hard to get it off.