Guys.... Simple fixes... Now if you cleaned your car as often as I cleaned our you would know this:

1. Water in the mirror casing.
When drying the car. Simply push the mirror in so that it folds in and then with out allowing it to click into position shake it a bit and bam the water is gone. Simply open the mirror after that again.
2. Rear window traps water.
This is very simple. After spraying the car down simply open the boot for a few seconds with a chamois/ microfibre on either corner of the window or just let the water flow out by itself. The reason I suggested the cloth was because in some GTi's the water does spill slightly into the boot

3. Rear badge traps water.
This is also simple. When you open the boot to allow the water to drip out the window ledge simple stuff a cloth in there to soak the water up. When you close the boot. Take it out. It only takes two minutes.
4. Honeycomb grills keep water.
This used to annoy me until I tried a few things out. So some tips. Forget about the honey comb grills and the entire front end. When you dried the rest of the car (dont do the door sills etc) simply take the car around the block for only a minute a do some heavy braking once or twice. The water simply glides straight out. If you are really anal then when you park the car you can open the bonnet and dry the top of the grill too.
If driving around the block aint your style. Then simply take a microfibre/chamois (Chamois absorbs more and wont scratch the plastic) and open the cloth on your hand and in a slightly violent manner smack your hand against the grills drying the cloth out. Then take the car around the block just for the fun of it

THE ULTIMATE SOLUTION! (For females only)
Ask the missus if you can use her hairdryer and just switch onto full power and blast the water out of the boot. Grills and lining. Just dont screw your paintwork up or damage the clearcoat. And no. Lipgloss is not allowed on the red piping on the grill

THE ULTIMATE SOLUTION! (For men only)
Forget the missus and get a leave blower. Great toy to have around the house. Useful for blasting leaves and little kids but very useful with the car as you just switch it on and blast all the water off with the leave blower and since its cold air it wont do damage and simply rub the car gently with a Microfibre cloth to give it the ultimate shine.
**I swear I am in no way affected by OCD**