A borescope will help in evaluating your cleaning process, you may be surprised or really disappointed in yourself/cleaning process.
I just watched a video on the vinegar & peroxide method, and the combo works but makes a dangerous (?) solution, so do some research on it first. I have not tried this method.
IMO, most solvents will soften the carbon buildup enough to remove IF you do it on a regular basis, but if left too long, it's a difficult job to get out.
google Teslong bore scope, they are fairly inexpensive and work well for the $$.
CLR works well on SS, but be careful about using it on other types of metals.
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Master Pidddler
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