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[Lyttlewyng]

Heat will eventually affect the L&L material.  It may even blister the plastic. 

For that reason, I've switched to the glass L&L or other brands of glass food storage containers. 

[GCR18]

I have a few with white spots.  Agree it's the microwave.  I tossed them and use Pyrex glass instead.  I save the lock and lock for things that don't need to be heated.

[momoftwo2007]

I am not the OP, but I learned a lot from you ladies!!  I am going to toss the ones I have with the white spots. And I am going to stop heating in the microwave with my lock and lock. Thanks!

[Fressa]

This could be either the microwave or the cycle on your dishwasher. I also noticed a bit if I didn't have enough rinse aid in my machine. I've only had a few pieces do this and they were very old. I recycle them to other parts of the home.(garage, storage room, etc.) 

I found that my heavy duty cycle with the sani rinse isn't vey freiendly to my older pieces. I still think that the product is good and I get my $ use from it.

[Katcat1]

@Aneed  I never had a problem.  Maybe it is the soap you used in your dishwasher?  Lately, I have been washing everything by hand.  My dishes look so much better when hand washed.

[PA Mom-mom]

Well, I'm not throwing them out. I'm old enough that something else is bound to get me before some build up of plastic. But, I agree that if it bothers you, throw it out or use it in non food uses. It isn't worth the worry.