Duuude, sniff test. yikes.

I used to work in the medical transportation business for about 3 years (wheel chair vans). amlost 100% were in a chair due to being severally obese. a vast majority of those were women. you can only imagine what kinds of smells permeated from their unwashed folds and crevices. the smell of decaying salmon on the side of a riverbank comes to mind......
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Roger That