How much you paying for that? Have you looked at whats in it? '0.9% neem oil' '99.1% other materials'................I wouldn't be worried if I could be sure it's just Neem and water, but 'other ingredients' is vary vague. It is possible the 'other ingredients' are just water and totally safe, but then you're basically just buying a bottle of water. It's all the warning labels on the back that worry me, You'd be better of getting pure neem oil and mixing your own. Much cheaper and probably safer. If you've got an Indian market or food store local, they sell small bottles of pure neem oil, cheap. Do not be put off if it looks a sludgy mess, that'll be because it's cold, it turns to oil again as it warms up.
However, and this may not be Gospel or be everybody's opinion, but I've suffered PM before. I believe that once you see pm on a plant it has got it, from that point you are only ever going to try to control it, you wont get rid of it.
What stage are your plants in?
If you're already flowering I suppose you'll have to ride it out and control it the best way you can. I wouldn't spray buds with anything but water. Check
https://www.rollitup.org/t/shlubys-garden.888312/ out, not sure where he is recently but he's just gone through this and done a stellar job.
If they're only young plants, 'I' would seriously consider ditching them as far away from my grow set up as possible and getting new plants going. It'll be a lot less hassle and cheaper in the long run. Your yields will not be as good if you are managing PM.(I'd check others opinions before doing this, but compare the price of a pack of beans to the price of a couple of ounce of lost bud)
