Another "AMEN" for the Clover white pen. It totally rocks. Also agree on "wait a sec for the marks to appear." They sort of "fade in." The markings are rock steady but wash or iron out perfectly, especially if you prewash your fabric. The ONLY time I had an issue seeing the marks was on some fabric I had failed to wash, and it had a TON of nasty sizing, which seemed to suck the markings. Sizing irritates my skin too, so I prewash 99% of my quilting fabrics.
I'm a hand quilter too and I ruddy HATE the grittiness of chalk.
I use the purple disappearing pen for light fabrics. In summer if you do not AC, it disappears REALLY quick.