IMO, dry lubes can be OK, but need to be applied often as when they get pushed out of where they're needed (between pins and bushings) they don't flow back in. That's why they're wet when you apply them, to flow where needed. If you hear squeaking, you've already gone far too long.

Proper cleaning of the chain (removing debris from inside the pins, bushings and rollers) is a bit tedious, and may not be worth it considering the effort involved, the amount it helps, and the cost of a new chain if you shop wisely. Keep it well lubed, wipe it down for cosmetic gratification, and replace when needed.