Need some serious help with my plants!!

ok so im pretty pissed right now.. started the other week when i notcied some powder mildew spots on some of my leaves.. sprayed with neem a couple days straight but nothing.. i guy on another forum who seemed like he knew what he was talking about told me a mix a should make to kill it.. said to mix halp cup bking soda, quart of water and some organic dish soap.. i even used way less baking soda.. went back tthe other day and sprayed all the plants.. it burnt the hell out of all the leaves on most of them.. the one is way worse then the other 2.. almost every leaf on the one is burned and crispy. the one is not horrible i should be able to save most of the leaves.. the last one is burnt but not to burnt.. sorry no pics btw.. i sprayed saturday i believe so i think they would have died by now but there all still alive.. im planning on going back tommorrow and trimming all the leaves that are dead off of the plants.. somes buds look burnt but for the most part there fine.. so heres my question.. will cutting all burnt leaves off affect it for the rest of its growing life? i was expecting big yeilds from these 3 but im thinking not so much now cuz they need theres leaves to produce buds.. how much will cutting leaves affect these plants.. i know im not gonna see crazy numbers from them but im hoping to atleast salvage them.. anyone got any insight??
 
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