How can I naturally get rid of spider mites/mealy bugs on my coleus?

I have been overtaken by spider mites and mealy bugs that have killed more than half of my beautiful coleus plants. I have tried rubbing alcohol and water, vinegar and water, natural herbicides, and nothing seems to work. They even attacked my purple velvet plant! This is war! I took them all outside thinking that maybe the bugs would eat them but going from inside to outside put them in shock! Any suggestions? I need some sure cure advice!

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