Magic Eraser - a Mommy's Best Friend
If you guys have any of those Little Tykes plastic houses/toys/slides/easels, etc, these Mr. Clean Magic Erasers work FABULOUSLY on getting them clean. We have a house that we keep outside, and this cleans it up nicely. We also have a Little Tykes picnic table, that was covered in crayon and markers (my little one loves to color!). I wet one of these guys and went to town on the table, and it looks brand new. I have the kind that has two surfaces, one white and the other a blue scrubbing side.
These also work great at removing scuff marks from floors, doors, and baseboards. Just thought I'd pass this along!