Just a quick message to let you know of an excellent deal on clay bars. I was reading on DW a couple of weeks ago about some 3M clay that was being sold on eBay, and while there's a lot of debate about its authenticity I took a punt anyway.
I bought 2x 160g bars from here for £4.92 delivered an they arrived today (9 days later). I just gave a small bit a quick go on a wing using Meg's LT as a lube and the clay seemed just as good, if not better then the Meg's stuff I usually use, in fact, this stuff is more malleable and easier to fold. I checked after with my stupidly bright Cree torch for any marring but I couldn't see any.
All in all, for the price and the amount you get, especially if it is the genuine stuff, even if it only gets used for wheels and windows, etc, it's too much of a bargain to pass up!
Here's a pic next to my keys for scale.