Mmmm seems its a myth
From wiki:
It is common in Europe, the United States, Australia and Canada for Corona to be served with a slice of lime in the neck.
The reason for the lime is that hop compounds degrade when they come into contact with light. This causes beer in clear bottles to turn 'skunky.' The lime is used to mask this aroma. [3]
Common myths surrounding the origin of the lime include:
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1. The lime was originally to plug the neck of the bottle up to keep flies and other insects out of the beer.
2. The lime was used to clean the top of the bottle to ensure it was sanitary before drinkers would put their lips to the glass. The acidity of the lime juice was believed to kill anything that could be harmful to tourists (actually, not very likely). Over time tourists began to push the lime into the bottle, which brings us to today's common occurrence of adding lime to Corona.
3. The lime was used to clean the neck of the bottle from the rusty remains of the bottle cap. In the early days the bottle caps were made very simply and often left rust stains on the bottle neck, leading to a rather bad taste. In Korea, slices of lemon are widely used in place of lime slices because limes are not widely available and are quite expensive in East Asia
