This is a question that comes up all the time, and I like most people am just an amateur with experience. I decided to do the logical thing and ask a fabrics person, Ms. Arlene Skull who knows everything there is to know about dying and fabric. (Okay maybe not everything, but more than enough to satisfy my needs. She’s got a degree in fabric science from university.)
Here is her official response.
“Spray with oxiclean and rub in. Let sit. Rinse. If not successful, make a paste with the [oxiclean] powder and rub in and let sit. Wash. Don’t put in dryer unless stain is gone as the dryer sets the stain.
Repeat as necessary.
The most important thing is “speed” – dilute fast. Then proceed.”
I assume OxiClean is available outside N. America. If not, you need to find a similar product.
In Stately Dr. Booze Manor, the carpets I am reasonably sure are acrylic fibre and pretty stain resistant. I use a Bissell spot stain remover with the recommended detergent. I used to use the Little Green Machine before this machine and it was great, so when it started wheezing, I bought this one.