This workflow is a refiner that uses three KSampler stages:
KS 1 with denoise set to 1 - euler/simple
KS 2 with denoise at 0,50 - euler/simple
KS 3 with denoise at 0,25 - euler/simple
However, you can adjust these values to achieve the best result—experiment and enjoy tweaking multiple parameters at the same time; it makes the process more fun.