If a coin happens to be really exceptionally dirty for whatever reason, it would not likely be of much interest to collectors unless it happened to be a particularly rare coin. Any method of cleaning a coin that I have ever heard of leaves traces of the process behind, resulting in an impaired coin. For example, there may be hairline scratches, visible only under magnification, pitting, or residual chemical damage.
Particularly in the higher grades, original mint lustre is a very positive attribute, but cleaning will eradicate any trace of it. Additionally, especially on raw silver coins, natural toning may occur, to which many collectors attach a premium value. This toning can be spectacular, ranging from blues to yellows, etc. Sadly, I have heard of novice coin collectors that cleaned beautifully toned coins to "improve" their appearance, and by doing so virtually destroyed the value of the coin.