how remove impurities inside exhaust manifolds

[legsroses]

Hi,
how do you remove differents impurities type, for whole lenght with circumference too, mostly there is soot residues with obvious dirty. I think should exclude however presence of deposits. I prefere possibly something of simply/quick, then nothing like sodium hydroxide. So suggest me your preferred method.
Bye Bye

 

[phar2slo]

Buy a Viking header set?

Off @Paul Bryant seemly the side effect is more HP.

 

[scot in exile]

Seafoam does a great job of cleaning heads ,exhausts etc do a youtube search for seafoam.

 

[warp9.9]

WOT !!!!!!

 

[scot in exile]

WOT !!!!!!

If that is what is needed then quite a few members have some very dirty headers

 

[legsroses]

I thought use too a pressur washer with detergent even, however I'm not quiet to do it since my doubt is if humidity should be avoided and regardless of everything. I worry too much or maybe I could solve using after washing an air compressor. Which is your opinion about.

 

[Claviger]

Steam is excellent at removing carbon build up. If this is on the polished stainless heat shields, honestly, elbow grease to polish the residue/grime after steaming whatever is left is the best method.