I prefer a shalk pencil or a water soluable marker. I NEVER use pencil. It is too hard to get off.

Someone else posted in the past that they use a bar of soap. Imagine it's chiseled pretty well to get a point or a sharp side.

I use soap for some things. By the time we are though bathing with it, it has sharp edges.

I had a piece that I marked with pencil, and it didn't wash out.

I use either white soap or Dial (gold). The Dial will show up faintly on white fabric.
After we have used a bar of soap and it is getting pretty little, I use it at the sink and use it every time I wash my hands. Doesn't take long for it to have a nice edge. I have several little bars in my sewing cabinet drawer.

Invest in a mechanical chalk pencil. Less than $12 and worth every penny! I marked the entire border of a quilt without a single breakage! Another plus, I had very little remarking to do after much handling! They come in several colors. I have the white and green and have used them on many different colors.

Those white erasers that engineers use in their electric erasers are great! Pentel also has them for the "Click" eraser at most office supply areas.

I agree.

I would use something made for marking fabric---special markers or a chalk pencil. I almost ruined a quilt I was working on because I used a regular pencil.

Thanks for the hint. I hadn't thought of using soap to mark a quilt.