... both... cleaner and better are the same thing? You are drastically increasing the purity with a wash.
Regular shit off the street is probably like 30-60% pure... (I'm guessing here). After a wash you can get 95%+ purity... (again guessing, but seems like it after my experience).
Regular meth I can smoke hits over and over and over... CLEAN meth I need just 1-2 hits and I'm good for HOURS
Dirty meth turns brown when smoking it (not the same as BURNING it) and leaves a white residue in your toot (what you inhale it out of).
Clean meth smokes clear and has a very strong rush after just 1 hit.
I've never IV'd so can't comment on that front.