Should one 5 hour burn rid of the PM? The room is 6x12, should I do one more burn before switching them into flower? Also do I need to wipe off the leaves at all?
I think that's plenty of time, you made sure the cup never hit empty, right? I would not wipe the leaves or rinse. If you feel there is still a chance of PM being present before you flip, go ahead and do another burn. I would not do more than 1 burn per week, but keep in mind I don't have problems with PM so I've only had to treat a handful of times for it.
You can also use a physical blocker, horticultural oil like JMS Stylets, and that works well in combination with using very high pH water (you want to get it to about 10 or so). Great care must be taken when applying JMS or you *will* burn your plants, it absolutely MUST be kept well mixed all the way through application. Even under T8 fluoros it'll burn.
So I just got home and I seen a few leaves with snall spots on them. Does this mean the PM is still active or is it just there but dead?
I'd have to see what you mean by spots, but if they look like PM then they likely are PM. The spots we see on the leaves are actually the fruiting bodies of the fungus, they're the sexual parts if you will. If you're still seeing it pop up after treatment, address environment as advised by connoisseur, and then increase your plants' immune response (aka SARS) by adding aspirin to the feeding/watering regimen. I prefer 1 tablet per 2 gallons water, others use 1:1 just fine. Don't go higher than that or you could cause sexual reversal and other weird things.
