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If you are going to use toxic chemicals, be sure you prepare the room with enough ventilation and a strong fan.
Keep in mind that you and Mom still need to breathe, and not risk lung damage. (This advice is coming from a chlorine bleach user in the past).
Use it wet...google it online for directions.
Can mom spray a daily dose of white vinegar on the doors? That will keep them clean between cleanings and stop water spots.
How much much later, though? I do my glass shower screen after each shower and I've got it down to about twenty seconds; so as long as you're not more than, say, ten minutes behind her just the cloth should be fine for daily maintenance.
I myself use Comet Erasers for this and it works very well.