Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hi Paul

For cleaning the spark plug you can use a brass brush (like for guns).

For remove the plug you can also use 8mm Glow Plug Socket.
Found on internet :
https://www.idparts.com/glow-plug-socket-8mm-p-10539.html

Last year (with my model engineer friend Christian of Geneva) we bough the spark plugs "Rime fire VR 2 L"
Very good quality.
http://sparkplugs.morrisonandmarvin.com/14-32.php

With Aspen fuel the plug is not sooty.