If the tooth brush works, keep using should be ok for smooth and 2nd cut.
Rasps and bastards can collect or even have the metal shavings welded to them especially some aluminiums, card brushes and wire brushes wont dislodge.
Chalks good even as a lubricant for those known to collect/weld metals.
No substitute for quality files Martin, cost more but last 15 to 20 times longer.
Portugese theres Bahco average, Tome Feteira decent but in a different league to the old Stubbs, Valorbe and Grobet up to 15 years ago. The old Valorbe 4" knife pre 2003 used to last three weeks, new ones a day top whack three days similar with all others.