How to clean the intake ports when the intake is off

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Hello,

I'm working on my valley pan today and while take off the intake, the ports is not as clean. Off course I immediately cover the intake ports after the cover is off. How do you guys clean some of the deposit in there? I tried to slowly blow (about 80psi) them out but it is hard and could take some time as I dont want to apply a lot of pressure. I did 2 out of 8 ports. Anyone done this please give me some advice.