I tried all the commercial products and the only thing that did any good was Nappy San. I made up a fairly thick solution and spread it over the stain and rubbed it in. Left it overnight and then removed it with a damp cloth. You’ll never believe this but the stain was caused by my dog eating a black snake and then bringing it up on the carpet, and yes, the stain has almost disappeared!
Published 16th December 2019