there are so many thing you can do with a alka-Selzer. here are all that i know.
to clean a toilet, drop in two Alka-Seltzer tablets,wait about 20 minutes, brush then flush.
To clean a vase, to remove a stain from the bottom of a glass vase, fill with water and drop in two Alka-Seltzer tablets.
To polish Jewelry, drop two Alka-Seltzer tablets in a glass of water and immerce the jewelry for two minutes.It should do the job.
To clean a Thermos bottle, fill the bottle with water, drop in about four Alka-Seltzer tablets, let them sit for about 1 hour.
To unclog a drain, clean the sink drain by dropping three Alka-Seltzer tablets down the drain followed by a cup of white vinegar.
Wait a few minutes, then run hot water.
i hope this helps.