Try water erasable pens from quilter shops. However, whatever kind of choose, please test it on your fabric first before using it. Different chemicals work differently, even your environment could affect the outcome and you may erase the marks from one fabric but not another. I am a quilter too and thats how we are taught to do before marking a whole quilt top :-)
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Have you tried using nylon thread to mark your lines ahead of time? Some use fishing or beading thread, or you could use Easy-Count Guideline. (Search amazon or google.) Its non-permament, and slips right out after youre finished.
Otherwise, youd need to test different fabric markers (Check your craft or fabric stores) to see if it will wash out of your fabric. I wouldnt trust it to work on all types of fabric just because it worked on one. (I love to sew, and have learned that not all fabrics are alike. So you would want to test between different brand and styles of CS fabric.)
I was a sewer before I was a stitcher and had just your standard water soluble blue quilters pen handy. Ive never had any problems with it coming out with a little water and have used it on sewing projects and cross stitch projects alike. You can find them at any fabric store.
another solution that Im looking at is thread. There is a product that is a grid thread. You simp ...
I use that system too although I havent seen the special nylon grid thread.
If youre using a normal sewing thread its best to use an almost neutral cotton thread so that colours dont bleed or leave fluffy marks in the fabric when you take them out.
There is an Aida fabric that has grid lines printed that wash out, but you need to be really sure that the floss you are using is 100% washable!! Learnt from experience!!
I now prefer to mark grid lines with thread, the fishing thread looks like a neat idea!! And reusable too!!!
Just as an afterthought - I recently came across someone using the Pilot Frixion Erasable pen for marking embroidery and quilting lines. Just passing a hot iron over the lines makes them disappear. There may be problems though if those marks are not covered by stitching because they can re-appear especially in cold weather!!!
I have 2 different kind of trickmarkers.
One it fades away in 24 hours, very handy when you make clothes.
One you can wash out with just water, Aqua trick marker from Prym. This you I juse for cross stitching. It holds a few months.
another solution that Im looking at is thread. There is a product that is a grid thread. You simp ...
Thats exactly the method Ive ended up using! Though, I just use regular sewing thread in a contrasting color. But its such a PITB!! I only make 2 lines at first, centering the pattern; and as I stitch to another 10, I stop and make more basting gridlines.
THANK YOU TO ALL who replied!!