Tony i don't know how you do it, you must be like a sniper with that pole.
I was cleaning in really bright light the other day and couldn't believe how much overspray i had even on a low flow.
if he's using pencil jets, a snipers accuracy shouldn't be too much of a problem.
Spot on, a rec' vikan & 2mm pencil jets(no over-spray), angle adaptor + practise & you're away. no vents, no runs, no hassle. Oh, but dirty frames though, mind, after 4 years not one customer has ever said anything about me not cleaning their frames!
It's a very efficient method & quite easy once you get the hang, i have a very fail safe & quick method of this technique now.
I could still clean the side frames but choose not to, although, don't get me wrong, i would if asked to.
tony