These are stains caused by food, tea, coffee, flowers, bird or animal droppings. To remove, wash surface with clean water and apply a poultice with a liquid base of hydrogen peroxide in 6% hair-bleaching solution.
Follow the same application instructions to the general poultice method. Tobacco stains usually respond to this same treatment. Urine stains should be attacked with a strong chlorine bleach poultice additive.