Have ago with te@@o shower shinejust spray it on and leave it ,we have a double shower so two large
sheets of glass, i just spray the lot mixer taps pipe to the shower head and hand held shower {all chrome}
and when dry looks brand new just like when i fitted it,
Another Tip ,,,When the tile grout starts to go black and it does,, in my last 25 years working in all types
of homes from posh to dives it was all ways the same, let the grout dry right out {baths / showers } mix
3 parts thick bleach 1 part warm water stir mix do not shake it just goes to frothy then in a jug pour bleach into a used up washing bottle, then pour from the top and let the bleach run down the joints and across leave overnight leave the window open a tad as it will get a bit fumey you might have to do it again
depends but make sure the grout is dry first,