I will speak up and say I was a non believer, but no more!
When I bought my '70 280Sl someone had applied after market mirrors to each visor. When I removed the mirrors that were simply glued to the visors, I thought I would never be able to remove the outline of the mirrors. I was not sure if it was grime or fading caused by years of sun rays, but i was thinking I would need to replace the visors to make them look properly.
After trying just about every cleaner possible (409, simple green, goo gone, several degreasers, etc,) I could still see the outline of the mirrors. I tired a Mr. Clean Magic Eraser and it immediately returned the visors to a look of new. Absolutely not fading or discoloration from where the mirrors were (or weren't).
I will admit I did not believe a sponge with no indication of what ingredients listed (do we really want to know?) and promoted as the cleaner to outdo all other cleaners, could do what other proven cleansers could not. Boy was I wrong.
Jim
I was skeptical of such sales pitches, but now I will be more open to new ideas.