My 2 cents about chalk, I have a terrific pen from Dritz that produces a fine line of white chalk. It works well and I love it. Now do you think I can find it? Nope only the refill of the little chalk leads . So I had to use a chip of yellow tailor's chalk. I did try to use it lightly. Have you tried a damp cloth or a spritz from you water bottle and wipe up the water and chalk with a microfiber cloth? It has worked for me, but everything depends on so many little factors such as fabric, time and how heavily it is used.
Went searching and this is a link to the Dritz refillable pen I have and love.
Dritz Fine line refillable Chalk pen I got mine at JoAnn's but ....no more.