White coats show every bit of dirt and staining that darker coats hide, which is why a dedicated whitening shampoo earns a permanent spot next to the all-purpose bottles rather than being a specialist afterthought.

This is a concentrated shampoo, diluted at 15:1 with water, built around white enhancers alongside extracts of cucumber, passion flower, lemon and lime. Wahl say it's moisturising and softening, removing dirt, grease and stains while leaving a silky texture and high shine on white and light coats.

• 5-litre bottle, concentrated at 15:1 dilution
• Contains white enhancers plus cucumber, passion flower, lemon and lime extracts
• For white and light coats
• Moisturising and softening formula
• Paraben free, vegan friendly, gluten free, phthalate free, alcohol free, sorbates free, phosphate free and DEA free

On the dilution. As with the rest of Wahl's professional range, this is a 15:1 concentrate rather than a ready-to-use bottle, so a 5-litre container makes far more usable shampoo than the size suggests - it's built for volume use rather than the occasional single bath.

Who it's for: groomers and owners of white or light-coated dogs who want a colour-specific shampoo rather than a generic all-coat one.