When your wife sees your neglected shower, you need to pull out the big guns to make her happy. Yeesh this is embarrassing!
Now get your tools together! You can order a Drill Brush online, I got mine off of eBay for about $10.
The Drill Brush is pretty much as advertised - a brush for your drill.
Things are going to get messy so you will want to wrap your fancy drill up in a plastic bag. Poke a hole to let the spinny part through.
Screw in the brush and you are good to go!
Prepare your tile to be cleaned by getting it wet and sprinkling Bon Ami everywhere.
...and get to work! Don't forgot to do your best Tim Allen impression while battling the soap scum and mildew.
Oh yea you should do the walls or your wife will yell at you.