Cleaning advice for you guys...
If you don't want to take the TB off you can clean it my using a rag and carb cleaner. To get get both sides undo the intake pipe, turn the ignition on (but don't start it!) then get someone to press the accelerator all the way down. This should open the TB.
Otherwise there is a good guide here: http://uk-mkivs.net/forums/t/127279.aspx
You can reuse the gasket I suspect but for the cost of £2 its probably not worth it.
If you don't want to take the TB off you can clean it my using a rag and carb cleaner. To get get both sides undo the intake pipe, turn the ignition on (but don't start it!) then get someone to press the accelerator all the way down. This should open the TB.
Otherwise there is a good guide here: http://uk-mkivs.net/forums/t/127279.aspx
You can reuse the gasket I suspect but for the cost of £2 its probably not worth it.