I cut the cloth into 8 smaller cloths, because I find it easier to use a smaller piece, and always keep the piece I'm using sealed in its own separate bag to keep it from making the unused cloths dirty. The instructions state to use medium pressure. I start out with the lightest pressure possible to take it easy on the jewelry and to make the cloth last as long as possible. When one side is completely dark, I use the other side. Discard after use. Never wash it.

While the company states it can be used on glass, I never use it on the glass parts of jewelry. Instead, I use gentle pressure with a water-moistened (barely damp) Q-Tip. If that's not enough, I use the same technique with Windex. Definitely do not use the cloth on rhinestones with an aurora borealis finish as it will scuff the finish. Also, don't use it on plastic for the same reason.

The company's safety data sheet dated May 1, 2002 (found at http://www.sunshinepolishingcloth.com/Material%20Safety%20Data%20Sheet%20SPC.pdf) states the following:

Components: 100% cotton flannel, aluminum oxide, fatty acid, wax, water, and emulsifying agent.

Use only in well-ventilated areas.

Do not breathe dust.

Wash hands thoroughly after use.

Using thin rubber gloves is preferred. (I use nylon gloves.)