It was somewhere outside Barstow when "Holly, in France"
wrote:

Damp newspaper followed by dry newspaper. The cheaper quality the
paper/ink the better.

Up to a point. You need to avoid coloured inks, which rules out most
of the free-ads papers. I use our local one because it's really awful
paper and cleans better than the Grauniad does - but I have to take
the colour-printed outer pages off, otherwise the red smears.