Just had a look at the touch up set I got - quite a while ago now.
Back of the box says "Touch-up Set: Basecoat + Clear lacquer with rust eraser"
Box contains 2 pots, 1 colour of car, 1 clear lacquer and some instructions.
Both lids unscrew to reveal little brush in the paint / lacquer.
On the lid of the paint pot though is a Red bit that's reversible.
Pulled it out and revealed on the other side a small fairly solid wire brush about 5mm long - scary
I have some text instructions and they call that bit a "rust eraser".
Here's the instructions I've got :-
Remove Red top (rust eraser) from the cap, reverse it and insert.
Remove any rust or dirt from damaged spot.
Apply Toyota genuine primer to prevent corrosion (PZ448-SPR10-09).
Shake pencil vigorously. Check colour shade.
Unscrew cap and touch-up with base coat.
Allow approx 45 minutes drying time and paint a second layer of clear varnish.
Do not use below +15 deg C (+59 deg F).
So perhaps the fibre rubbing pad is what you get these days instead of a wire brush - so lucky you
TG