Audio Head Cleaner ... seminal work!

My parents divorced in 1981 and my American mother returned to the States. We then received a Hamleys catalogue every November to choose our presents. My brothers and I had a telescope, a microscope and tons of other stuff. All sorts of weird gadgets. I had a horse racing calculator.
 
I always loved the Sky Mall in-flight catalog that you got on long haul flights - it was the most useless, yet compelling "tat" that was on sale, often at ludicrous prices.

They still operate, but post bankruptcy, the stuff they sell is cheaper and more practical.