as a hukam to most amritdharis ..... wash you hair twice a week to keep the cleanliness intact and the thing about the nails is not at all justifiable with the hair because hair are on the top .....having utmost spiritual importance according to many religions .......why wud ancient hindus like in dwaapar yug like arjun and Lord Krishan would keep their long hair........think about it ..... theres a reason to why we all have been given a common identity.....there a symbolic meaning to it .....think about it.....