I've got something like this and it works a treat. You can pick one up at most hardware stores - maybe even at a supermarket or $2 shop. It's also best to scrape the glass down every couple of times you shower. That way you don't have a whole lot of grimy soap build-up when you go to clean it properly.
I only use spray when I give the bathroom a proper clean and I go for Shower Power. My one tip when using it would be to make sure the room is well ventilated. It's really potent! - Jackson
I have a small shower squeegee that I leave in the shower and give the glass a quick clean a couple of times a week. I also use glass cleaner and give the panel a good wipe with a paper towel or cloth every few weeks too. - aly
Cheapest cleaner is to dilute vinegar, put it in a spray bottle & label it. If doing a first clean of grimy glass, use a non-scratch scourer and a stiff bristle brush for the grout and tiles. To make it easy on yourself, use liquid soap when showering, it doesn't form that mould promoting soap scum.
If you just want to wipe down the cubicle at any time, I highly recommend micro-fibre cloths, a smooth one for glass, & a napped one for the rest. - Andy_Mann
I swear by the CLR Kitchen and Bathroom Cleaner. Have tried the home remedies and other cleaners. The only problem is that it doesn't smell very nice so make sure you open a window. - darylhewston
To stop scum and residue build up all together don’t use cake soap, use liquid soap / body wash. But if you already have residue build up, simply water and use a 'Magic Eraser' sponge, available at Bunnings. - JoJoTested