Hope this is the correct section........

As a matter of 'routine' maintenance, tomorrow I was going to clean up my air intake/throttle body flap and the EGR valve. If I remove these items to clean, do I need new gaskets? Secondly is carb cleaner the best way to remove the carbon build up? Lastly, as it is a Direct model, I assume I drain the coolant first before removing the EGR, is it best to replace the coolant or would it be ok to re-use (been in around 2 years - long life stuff)

Thanks