"He who marches out of step hears another drum." ~ Ken Kesey
In the past, I have experienced some issues with plastisol print in the vicinity of the blowout getting more brittle due to apparent plasticizer leaching out due to the spray-out chemicals. Not consistently, but an issue nonetheless. So, at the very least, use as little as possible, and try to reduce overspray with an eraser shield or something similar.
IMO salvaging is a poor business decision. Spending the labor to spot out or what ever only to deliver substandard product is never a WIN. All the would have/should have mumbo jumbo means nothing to the customer. Appears to be a good thing the printer moved on, a lot of errors with such an experienced staff. Be a stand up vendor and deliver top notch product, it never feels good to ship crap.
spot cleaning guns are for SPOTS, not mistakes. Buy new ones and move on.
The time will be killer, you could be doing something that makes a profit with the time it takes to blow them out and re-run. I'd replace them and move on. Steve
Sometimes, it's better to just learn from mistakes, suck it up, and start again with the reachable goal of a perfect job of which you can be proud, and the the client is appreciative. It's an expensive product and deserves great execution rather than what one can get away with.