As much as we love our Paint Putty, one of our suppliers suggested we try their triple bar clay. This is packaged like bright orange processed cheese, in between two bits of plastic. The idea is that you can tear off a smaller bit more easily and put it back into the wrapping when you've finished. You also get a little bit more in the case. 240g compared to 200g.
Anyway, it's a mild to medium grade clay that's quite a versatile performer and its light colouring shows up the dirt really nicely - so you know when to chuck it. For legal reasons, this clay isn't for sale in the USA and we will deny any knowledge of its existence if you try and smuggle some across the border, hidden inside a huge brick of drugs.