Can confirm - Alpine WSG is like a miracle for both bed bugs and roaches. It is both incredibly lethal, and slow acting, so bugs spread it to the places they are hiding, as well as the paths they take for food/water. Over time it will take out even very stubborn, hard to reach reservoirs because of the horizontal transfer properties.

Tbh, I find it a bit hard to take people suggesting DE seriously. It’s just not effective compared to modern treatment approaches, doesn’t really have any unique benefits, and is arguably way worse for you.