Cleaning HT lead contacts

[TomB]

While taking my plus and leads out for work on the engine, I noticed some brown rust like marks on the spark plug contacts. I’ve cleaned these contacts with a small wire brush. Looking down the HT leads I can see brown residue and I’m thinking this could impede a good spark. Has anyone found a good way of cleaning these contacts? I’ve wondered about some 1000 grade wet and dry wrapped around a drill bit, but think ideally a small brass pipe cleaner or something similar would be perfect. 

Has anyone ever found a good way to clean theses contacts? 

[SM25T]

Maybe try a pipe cleaner dipped in switch cleaner ? Or just the abrasive effect of a drill bit pushed into the contacts and out by hand a few times.

[TomB]

https://www.ebay.co.uk/itm/20pc-Small-wire-pipe-brush-brushes-brass-steel-nylon-rust-clean-hex-drill-shaft/401524521758?epid=2255406648&hash=item5d7cb9fb1e:g:Y7kAAOSwZR9ajZCy:rk:19:pf:0

This pack of brushes has one that would do the job - ideally Id just buy the one I need! 

[Wrightpayne]

Carefully aimed thin screwdriver used as a scraper - might need your head torch!

Or some scouring pad clipped into artery forceps. 

Ian

[OliverSedlacek]

I wouldn't get too hung up about HT contact resistance as there is typically several thousand ohms of suppressor resistance in the leads or plugs.