Rice is abrasive enough that it should scrub your feeder clean. Strain out the rice and throw away, and rinse your feeder thoroughly. Cotton-tipped swabs or an old toothbrush can be used to clean feeder ports. Bees and wasps can be a big problem for some who feed hummingbirds. The mixture will not be as attractive to bees, but it will still attract hummingbirds.
Ants can also be a problem.
The mote hangs above the hummingbird feeder. Filled with water, it provides a barrier that ants can't get past. If you have that problem in your yard, try hanging more than one feeder in different parts of the yard, preferably in places that the birds can only see one feeder at a time. Enjoy your summer jewels. Start a discussion.