OK, sounds like you've used the ER80 before and probably mix it at a 1:10 up to 1:30 ratio, chem to water.
FYI- Anything stronger than 1:10 can cause your problem.
Are you spraying er80 solution on both sides of screen, and after application,
do you work it into the emulsion with a brush or sponge to help the dissolving stencil?
When you water-spray remove the stencil, are you starting at the screen bottom and working upwards?
Did the ER80 dry on the screen during the process? If it did, it will essentially "lock" the emulsion on the screen and make it nearly impossible to remove.
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If the ER80 is mixed too strong it will actually "over-strip" (over-oxidize) the stencil too fast and lock it in, same as it drying on the surface as Pwear indicated.
If the strong mix is rinsed down before the stencil is fully blown off the mesh, those rinsed areas won't easily reclaim.
That is why stencil removal from the screen bottom upwards can be a good plan in many instances.
Before you fire your husband from his appointed screen duty and create yet another unemployed screen cleaner,
do you have a self-serve car wash (spray booths) nearby?
Another solution would have been to use a Haze Remover, let it sit, then wash it out with the pressure washer as mentioned before. I use that stuff on those stubborn screens and I have never looked back.
Help I can't get the emultion off my screen 
Re: Help I can't get the emultion off my screen 
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