I bought correcting pen in Jusco before...
it is brand of ((Tide)))..
just next to the washing powder for clothings
(I cant find it in other supermarket!!0
It is just like a marker pen in orange and white colr, and sa packing in same color.
u just ask the shop worker where is it they will know..
it is onlt $20 something ..very cheap
it can clean the dirt made by pen ink or food also...
100% work in my experience..
it is small u can keep in ur hand bag everyday~!!