Moths & Spidermites??

depending of what stage they are in, i would either bomb, or spray with avid or azatrol..

Mites generally result in white spots from their feeding on the tender undersides of the foliage.
Could be thrip poop? I'd try and rinse the affected leaves off first.

Yes, water . . . you can add a couple drops of dish soap, but then you may have to rinse twice, first w/soapy water, then clean water? I'd use a hose outside and let the pressure do the scrubbing.
As for the yellowing, I've not encounter TOP yellowing, so good luck w/that.