I’ve recovered a couple of ugly looking (i.e. rusty but not worn out) chains by soaking them for a few days in EvapoRust! It’s important though that the chain is completely free of dirt, oil and/or grease as those things prevent the EvapoRust from getting to the rusty parts. RE: the pedals, I’ve not had to refurb any rusted like the OP’s but EvapoRust may work here too. I would disassemble as much as possible as it will be hard to get the grease out of the spindle bearings before soaking in EvapoRust. The chainring bolts look to need some attention too!
I hope the OP finds a more appropriate storage location for his bike next Winter.