I recall the other day on the subject of gunged up Bosch dishwasher drain/fill matrix. In particular the air vent plunger that sits at the top of the matrix and is impossible to access to clean.
Well, as it happens I had a gunged up Bosch today with a nosey parker customer breathing down my neck all the while I was wrestling with a gunged up pressure chamber. When she spotted the gunge (like one does) she pipes up….“I know what’ll shift that!”….and then produces a bottle of this stuff……………

I’ve never heard of it before but I squirted a shot of it down the open end of the matrix whilst it lay on it’s side. My customer suggested I leave it for a few minutes then rinse it out with warm water. Sure enough, after I’d cleaned the pressure chamber and transfer hose and was ready to fit the matrix back, I flushed a pint or so of warm water in through the hole…..
BL**DY MAGIC.. came up clean as a whistle and thought I’d pass the tip on to you guys. 😀
I need to buy a bottle of the stuff (Domestos Grot Buster)next time I’m in Tesco methinks. 💡