re: Update in OP: Get smell out of Rtic soft sided ice chest

put a newspaper inside. I always put news paper at the bottom of my cooler after i rinse it out. it will absorb all the smell and you just leave it inside until the next time you use the cooler. It has completely removed some nasty smells from my coolers.

Try a scrubbing it with vinegar

Let dry, squeeze a Lemon in their, scrub with that.

Let dry, sprinkle coffee grounds, let sit for a while.

Send it back and tell them it randomly got a chemical smell

Last year, the power tripped at my camp for about 2 weeks in the summer. The only thing in the fridge was a pack of chicken gizzards. The vinegar definitely helped, but what finally did the trick was the coffee grounds.

Make a paste of backing soda and white vinager . Apply to inside walls let sit for a day. Guaranteed to work

Guaranteed

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So, in the trash it went.

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Well that's just dumb.