I’ve been on a cleaning spree recently. (It feels and smells like spring here after all.)
and OMG! I love these thingies. They’re totally addictive…. Magic erasers are this little white sponges, that you get a bit damp and then scrub away at all of the annoying dirty marks in your house that normal cleaning can’t get rid of. They make cleaning super fun… Or maybe it’s just me. 
I’ve used them to get rid of spots that I thought were white paint on my wooden cabinets… dirty lines in the creases of linoleum… hard stuck on grime in bathrooms, and tons of other stuff. In addition these have even made scratches on my kitchen counter disappear… almost magically.
But yeah. I love these. Pick them up from almost any grocery store. They cost about $4 for a pack of two sponges.
i’ve seen those – will have to check them out.