The way I do it may not be the "right way", but I use bicarb mixed with water to a paste and use that to scrub stuff (the bicarb gritty-ness helps get off dirt and grime) using a cloth or a scrubbing brush depending on the job. I use an old toothbrush with bicarb paste for grouting.

I then spray it down with vinegar (and let it froth) and scrub it froths on stubborn bits.

Use clove oil spray to kill mold spores in shower (mix 1/2 teaspoon of clove oil to 1 litre of water in spray bottle).

For the sink, put some bicarb in it, pour some vinegar down and let it froth up. Bi carb nutralises the smell and vinegar kills nastys making the smell. Maybe put some eucalyptus down and around the drain to make it smell nicer too?