On Friday, May 22, 2015 at 1:53:55 PM UTC-7, notbob wrote:
> My mom's house is pretty dirty from her having never cleaned the upper
> levels of this small cathedral ceilinged park model. Grease from the
> kitchen has been accumulating for yrs. I've tried my fave grease
> cutter, 409, and it knocks off most of the crude, but a stubborn
> residue remains unfazed. Almost like plaque.
>
> What do resto kitchens --or their hired cleaning services-- use to cut
> the grease in the exhaust hoods? Anyone know?
>

Have you tried TSP?