On Mon, 24 Jul 2006 07:56:05 +0100, "Jeff Gorman"
wrote:

Though I haven't tried it, cat litter is reputed to work.

Grey fuller's earth cat litter, and not scented. The expensive sorts
and the red clay sorts don't work.

Ball mill it before use (shake it in a bucket with a couple of rocks)
and spread it out thinly on baking trays or plates.