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I gave up trying to grow anything under the front window and
resorted to liberal applications of Jeye's Disinfectant powder which
masked the stink as well as being 'uncomfortable' for the cats.

Find a chemical wholesaler (such as Hay's, if they haven't been taken
over) and buy a small drum (I think 500g is the minimum) of aluminium
ammonium sulphate crystals, and sprinkle a few on the soil.

It's not expensive, you can't see it (after a while), you can't smell
it, it isn't dangerous, and it breaks down into useful stuff for plants.

Cats will avoid it.

--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
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