ArchAngelCD
Member.
Put the upper in a sonic cleaner and go eat lunch or dinner. When you're done eating the upper will be spotless. A quick wipe down of the lower and a good spray lube on the upper and your AR is better than new.
.........It drove me bats to hear NCOs or Officers in the Army in the 80s and early 90s telling soldiers that essentially, their rifle would likely fail them if it weren't kept very clean... total hogwash... I think it is irresponsible to falsely ruin a soldier's confidence in his weapon's capabilities. However I do think many of these young and inexperienced leaders actually believed what they said as it was simply what they were told. Truth was most of M16s that I saw choked because their magazines were bent to crap and not replaced or even taken out of service, or the gun was used way beyond a reasonable service life.