Always use lukewarm water and rinse all traces of the shampoo off so the dog does not begin itching due to shampoo residue left on the hair and skin. (dogingtonpost.com)
This is an effective way to remove shampoo residues from earlier cleaning attempts. (mindbodygreen.com)
Thorough rinsing is important because shampoo residue may cause skin irritation. (thedrakecenter.com)