nonnon

I'm making a quilt that will be for decorative purposes only. The fabric is dry clean only. What kind of marker can I use?

I know about the heat sensitive pens but I read that if the temperature drops (I'm in Canada) the lines re-appear.

And I read that the air erasable ink sometimes doesn't go.

I'm wondering about tailor's chalk. Has anyone here used that? Does it brush off easily without damaging the fabric? What kind of brush is used? Any word of caution?

Thank you so much!