I usually use chalk (white only) as this is the easiest to remove, I use the one by Clover. I have also used a pounce pad, but be very cautious of the blue, never use full strength or it will not come out, also be sure you get the iron off kind much easier to remove. I have used the blue water soluable marker, don't leave on too long and just spritz with water to remove. Just remember it might come back later it will sink down into the batting.
Jo