If you put white vinegar and water in a spray and wope bottle you can just use it as per snw...
Bicarb and water to make a paste will replace your Gumption (use this for grout etc...or stibborn bath grime) and if you use a chamois after each shower or bath and dry the shower you wont need to clean it ANYWHERE near as often.
If you are really keen and have access to it, you can use oregano to clean as bleach - it is actually about 25 times stronger than bleach naturally. Just boil a whole heap of fresh oregano in some water, cool it and put it in a spray bottle


PS White vinegar spray is also a fabulous air freshener Gets rid of everything from cigarette smoke to curry....just pray it around the room and the vinegar smell will go in a couple of minutes and leave a great smell - NOTHING! lol
Good luck!