The problem with these sprayer nozzles is that don't crank through 90° degrees, only about 45°, which will work somewhat.
The 90° nozzle that K'archer make for their lances is way less wieldy but does get in there.
Eventually however, (just like the bath drain that I am repurposing for my yet to be installed shower) they will succumb to crud, just a different kind of crud to the soap scum, hair, old toe-nails and general bodily detritus that all the previous owners of Phmode Hovel have failed to clear from the inadequately inclined pipe work down the decades.