Just a tip here - if you want to minimise scratching of the plastic, be sure to use a blue coloured scourer pad.
The reason for this is, that all of the green coloured scourers contain sand, and they will even scratch Pyrex [borosilicate] glass! And car windscreens too - a bloke I know found that out the expensive way...
+1 on using a mild detergent, too. Dishwashing liquid, or even cheap shampoo, are about the mildest.
