Cleaning a clear Iphone case?

I bought a clear hard rubber (TPU?) case for my iphone, worked will as meant i could see the colour through it clearly.

However I've noticed its gone from clear to a slightly off greyish colour recently and to top it off slightly yellowish in places where i guess residue from cigarette smoke (Smoker) has transferred onto it.

Anyone offer any tips of cleaning to remove some of the discolouration or get it looking a bit cleaner again?

Dust it off.

Wash it and dry it with soap

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