Hello, I have a Speedy 25 with blackened handles that I just want to clean up a touch, and I've heard that a lot of you use Magic Eraser for this. I went onto eBay to look for these, and is this what they are? They just look like plain sponges, is there any solution built into these or is it a mechanical cleaning action? Also is there anything else I should know about using these to remove grime from patina? Would I need a lot of them to do a pair of Speedy handles? Any other products recommended? Thanks for your help!