P-A-M is effective just be careful and treat it with the respect it deserves. I would be tempted to spray the P-A-M outside and wear gloves too. It is not hazardous if used exactly according to the directions. FOLLOW THEM! read it over a few times before use it, and plan out what you are going to do gather the things you need and then use it. Chemicals can bite back and what you do not know WILL hurt you.