Literally cleared the moss from my Easterly facing patio within 24hrs, even cleared up some of the lichen and black spots. Easy to prepare, I used a 5 litre sprayer, and no noticeable odour. Kept my dogs and cats in overnight and the product had dried in by morning so felt the animals were safe to use the space again. Will be trying it over winter to see how it deals with low light moss build up in harsh Scottish climate.