What’s going on here?:

Melting?

The white thing is a shoe shaped hunk of something that’s meant to make rooms smell nice. It’s on top of a plastic pen box. The melty-looking streaks running down the side are not running freely; they’re solid. They’ve assumed this position after months of being slowly melted. But what is going on? Is there some horrid lime mixture in the soap that can melt plastic? Does it make the room smell nice by pumping caustic gas into your lungs? Answers on a postcard to Childrens’ BBC, PO BOX 8999, London, W12 6WR.