[Dave in MN]

When I find it necessary to clean threads, I have loaded the tap with stiff grease to capture the debris. Fully fill the taps cutting area and the openings between the cutting surfaces. I turn in continuously until I feel the tension lighten, which means the debris is cleared and then back out. I then fully clean the tap in solvent, dry it and re-apply the grease for the next hole. I repeat until done.
Checked with my bore-scope, I do not see any debris in the combustion chamber when finished. Hope this helps.
Good Day!