What's The Best Way To Remove Carbon Deposits?

[Rasteirinho]

Hi mates,

I've been working in my intake manifold but it is full of hard carbon deposits due to the high mileage (270.000 km).

Especially, the TVIS plates are all messed up with very hard carbon deposits.

What's the best/easiest way to remove it... I had already tried with a powerfull degreaser that i'm using to remove the oil from other parts, but without much sucess with the carbon deposits.

Thanks for your help