The message
from "Martin Sykes" contains
these words:

I used a cocoa shell product soaked with renardine to repel cats in my
garden. it worked but I think the smell was worse than the cat cr*p

Sprinkle Aluminium ammonium sulphate crystals ove cat-affected areas. No
smell as far as my nose goes, and harmless.

You might have to find a chemical wholesaler. I think I had to buy their
smallest pack - a 500g plastic drum.

--
Rusty Hinge
horrid·squeak&zetnet·co·uk
http://www.users.zetnet.co.uk/hi-fi/tqt.htm