Taking a shower right after you put fake tanner on may help a little to get rid of the tan, if the lotion is still wet. However, it will most likely cause a lot of streaking. Taking a shower after being in the sun does not affect the tan/sunburn in any way.
You can exfoliate your skin after getting a sunburn or tan to help get rid of layers of skin that are sunburn, however this probably wouldn't be a comfortable method! Unfortunately, the best way to get rid of a unwanted tan is to just waiting for it to take it's course. In the future, make sure to wear sunscreen to prevent skin coloring! [ eslx32's advice column | Ask eslx32 A Question ]
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