Green-Um Spray Dealing promptly with the effects of damaging pet waste on your lawn will also help to reduce the amount of re-seeding necessary to cultivate a healthy and luscious lawn. Contains totally safe and bio-degradable ingredients so it does not harm you, your lawn or your pet. Direct the nozzle in the direction of the soiled area and spray the Green Um until the patch has been covered. 250 ml Trigger spray (8.93 fl. oz.).