Rinse the pieces with clear, hot water and dry them thoroughly with a soft cloth. Clean your silver and silver-plated silverware by mixing an organic solution of 1 tablespoon of salt with 1 tablespoon of vinegar and 1 cup of hot water. Double the cleaning solution if you have numerous pieces of flatware to clean. Pour the cleaning solution into a small pan and submerge the stained flatware, along with a 3-inch piece of aluminum foil, into the liquid cleaner for up to one hour, depending on the amount of tarnish and spots.
A good rule to use is two weeks. Now, if you happen to have found a great price on bulk coffee, and you don't plan on using it within two weeks, the freezer can be an acceptable one-time shot. What this means is that once you take it out of the freezer, it should never go back in.
In most cases, caffeine has a half-life of about 5 hours (meaning 5 hours is needed to eliminate half the coffee amount). However, it might take longer â for instance, a pregnant woman might have caffeine in her system up to 20 hours after she ingests it.