I love all of the bio groom products,
For cotton coat have you tried laser lites?
I got it at a dog show and loved it for my cotton coat boy, only thing I found made him shine in 6 years, like you I tried it all.
The bottle lasts forever, the shampoo comes in different colors I bought the purple, the conditioner was also nice.
Also if you email bio groom they will send you a sample.
Not sure you can request the type nut I found most are wonderful |