I have compiled the following information to help you get a lifetime of use out of your  Tupperware® brand products and to keep them looking and smelling as good as new.  Please write if you have further questions or,  if you have other ideas which you think should be added to this list. 

A couple things to note before we get down to specifics strategies. 

• Prevention: The best way to deal with odors and stains in your Tupperware® is prevention in the first place. The fundamental guideline here is to use your ware appropriately and rinse it immediately after use, even if you don't have time to wash it thoroughly. 
  
  
• Warranty:  Please remember that stains and odors are not covered by the Tupperware® warranty.  These are "cosmetic" problems and do not affect the bottom-line usability of the products.
  
  
• Sticky Tupperware®:  That sticky feeling is removed by using a baking soda paste.  (Note from Bess:  if your dishwasher is set so it won't melt your Tupperware®, running it through on the top rack will usually take off all the stickiness.)
  
  
• Scratches:   Don't use sharp utensils or knives on Tupperware®.  Scratches are not covered by warranty.  To keep your clear or colored/clear tumblers looking great, do not stack them.  Stacking causes small abrasions that will make the tumblers opaque over time.  Repeated washings in the dishwasher may do the same thing!

How to Combat Odors in Your Tupperware®

• Prevention Tip:   Tupperware® should be stored with its seals OFF to allow air to circulate freely.
  
  
• Newspaper/Charcoal:   This is the classic method of combating odors.  Crumple up newspaper, sprinkle it lightly with water, place in sealed container and leave it for a day. The charcoal in the newsprint will absorb odors.  Putting a piece of charcoal, such as what you'd use for a BBQ, in a sealed container also works.
  
  
• Baking Soda:  There are a couple methods here.  
  a)  Put baking soda in the container and shake, leave it for a couple hours/days . . . .
  b)  Make a paste of baking soda and water and let it set. After letting it sit, then rinse with water and wash normally. Repeat as  necessary.
  
  
• Alternative methods:
  a)  Place the container upside down on the grass outside.
  b)  After making coffee, put used grounds in container and let set. Some folks recommend drying the grounds first but I found it worked when they were wet.
  c)  Try rinsing it with lemon juice and then wash it as usual. 
  d)  Put a crumpled paper towel in a sealed container with a bit of kitchen cooking vanilla on it. Some folks even keep containers such as thermoses, coolers, etc., stored tightly closed in the garage with a vanilla paper towel and it seems to work well.

How to Remove Stains from Your Tupperware®

Note: Many folks find that stains will mostly come out through using the product over and over. 

Prevention Tips:

• Fill containers with food that has been cooled to room temperature first. The heat contributes to the possibility of staining.
  
  
• Rinse the container with cold water to "close pores" right before storing spaghetti sauce or other tomato-based sauces/soups in it.  
  
  
• Use a light spray coating of any cooking spray such as Pam on seals and containers prior to filling (as above).
  
  
• Rinse any Tupperware® container which contained greasy food or food that might stain with cold water first. Then wash with hot soapy water or in dishwater. Rinsing in hot water will set stains.

Removal Tips:

• Baking Soda Paste:  Use a baking soda paste (baking soda and water) and rub into the stain. You 
  can then rinse with vinegar (optional) and wash normally.
  
  
• Sun:   Place container outside on a nice sunny day and the sun actually bleaches the stain out. 
  
  
• Bleach:   Please note that this is not the first option to try but one to use if the stain is really persistent and you've tried the other methods. 
  a)  Make a strong solution of dishwasher detergent (which usually contains  bleach) and water (1/4 cup detergent to 1 cup warm water) and let it set on stain. 
  b)  Alternatively, add bit of bleach to water and let it set on the stain. If it doesn't work, make it a little stronger and repeat.  Then wash the container normally prior to use.
  (NOTE:   This is NOT to be used for Microwave used containers, because the bleach stays in the pores and can fume into your food when micro waving.)