The maintenance of the oil paint brush requires you to wash it with turpentine or pen lotion after use, and then wash the grease with soap again, then dry it, and wrap the pen with newspaper or toilet paper. Put it in a ventilated and cool place!

Children's colored pens, the kind is to pay attention to the cover.

If it is hairy, wash it with soap and spin dry, and wrap the pen with newspaper or toilet paper. Put it in a cool and ventilated place!

This is the process for both sheep and wolf hairs, but it is best to wash the pen while keeping gentle movements.