Have you ever tried washing a tall glass with a regular sponge before? If you have, especially with those with "deep" builds, then you will be perfectly aware of just how difficult it can be to obtain effective cleaning results. This is usually due to the fact that it can be quite difficult to fit your hands into the cup and actually get at the corners you want to clean. This ultimately makes cleaning difficult and stressful.
However, cleaning doesn't have to be stressful or challenging, and with this long-handled brush, it certainly isn't. You will be able to use this tool to eliminate stains easily from your cups.