NAF Five Star Muck Off Stain Remover 500ml. The NAF Five Star Muck Off Stain Remover is a powerful formula designed and made especially to treat and remove stubborn stable stains. Spray the Muck Off Stain Remover directly on to the stained area, massage well with a cloth, leave for 5 minutes and then lift the stain off with a damp sponge or cloth. NAF have not found anything that the Muck Off cannot remove, leave your horse or pony spotlessly clean with this amazing stain removing formula.