Lens Cloths (1 Viewer)

A quick question about lens cloths. I like most people on here are the speccy kind and usually when I get a pair of new glasses I have a lens cloth thrown in with it. Would these be fine for wiping optics? I have a spotting scope F-ED would it remove the coating or should it be fine? I have four of them two are smooth feeling and the other two are soft feeling.

I keep a new Pentax, Swarovski or Viking microfibre cloth and in a small sealed plastic bag for my scope and bins. Another is kept for spectacles which often get grease on them. A quick breathe on the lens and a wipe is usually all that's needed. The ones you get with glasses are of a poorer quality and usually kick kick about in the case gathering dust. I even keep another clean one for the camera lens. One scratch is all you need to ruin an optic so I'd rather be a three cloth/three bag man!!!
If you want to use your existing cloths, wash them first in washing up liquid and keep them in a sealed bag.