For strikers I use a very low grit sandpaper and put a little square in the palm of my hand and press striker into it and give it a twist or two
All surfaces if they get dirty or oily I will wipe down with rubbing alcohol and let dry before conditioning. On aluminum this is all I normally do
For slates and ceramic I like red scotch brite. Rub back in forth a few strokes in same direction and lightly blow off excess
For glass I use plaster sanding screen same as what I do on slate
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