Stupid mistake
 

If it isn’t one thing, it’s another. I was going to do some appliqué on a quilt for someone special. I used a supposedly washable felt pen to freehand the ‘branch’ for the flowers in a similar color. The pen marks are behind the stitching and very visible (bright lime green).
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I tried spritzing water on it to remove the marks...nothing happened. Then spray-on stain remover. The marks on the bottom have faded some, but not these. I can’t wash it because it’s not bound or quilted.

The only thing I can think of is to pick out the stitches and do the stitch over in a darker and slightly larger stitch, unless someone has a better suggestion. I tried to upload a pic but it just wouldn’t go.

I wouldn't take out the stitches but add more to them with a light green to camouflage the marked lines. I would do one and see before taking out all of them.

Stitching over sounds better to me. I’ll just make the ‘branch’ darker and a bit thicker.

Alcohol and Grandma’s Secret Spot Remover didn’t work, either.��

Club Soda worked one time for me with a permanent pen.

A couple good suggestions above.

Can't offer any better suggestions, but maybe your pic was too large to post. If you size it down to around 400x600 it should work.

Can you contact the manufacturer for some suggestions from them?

This is what I would do. The lighter green woven through the darker green will give a nice stem color look.

I took a class from Sandra Leichner and she sometimes uses two or more rows of stem stitch next to each other. Sometimes she uses a single thread wrap stitch to combine the two stems.