You can also go to CVS and look in the womens eye makeup section for the small -White- Nylon Bristle Brushes. They are tapered and about 5/16 in. wide x 3 in.long. They are un coated and super clean. They come in a zip lok style bag, for about $2.25 Use canned air to charge them before using them, gently brush the sensor, along with using a blower. They use the same White Nylon as the $ 30.00 white nylon brushes that are sold as sensor cleaning brushes. You can also find good quality artist brushes made of the same tapered white nylon " with no sizing on them " in various widths that are perfectly safe for sensor cleaning. Just be careful not to saturate the top of the sensor with cleaning solution to the point where the liquid may migrate under the filter on the sensor. A little goes a long way.
Good luck. Ken