Pictures plant tip are browning & brown spots after using soap insecticide..PLS HELP

i just noticed the other day that there were mites on my plant so i looked up some homemade insecticides and i found the simplest one:soap insecticede

i mixed 3 tblspoons with a gal of water & sprayed it on my leaves, today while starting the day cycle i noticed my plant was dying

the tips on most of mt leaves are turnig brown and slight gray. the veins have brown spots all over some leaves and are starting to spread.

whats best thing i should do, ive tried searching this but i still havent found anything related to my prob yet, so please any advice would be great\

heres some pics

im thinking of trimming the infected areas or just cutting the branch off. im not really sure of what to do. thank u in advance

Start spraying with clean water to rinse them off good. The soap works very quickly on bugs. They get the raging shits and die.

Get rid of plants they're not that big yet.Clean the room extra well. Start over with new clones or seed. I hate bugs and its not worth the effort to save at this stage of growth. Better than fighting on going battle for next 2 months. Good luck

thanks killer, so how long do you think it will take to get a full recovery!