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This.
If it still feels smooth it suggests that your shiny finish has acquired some paint or something which is sitting on top of your lacquer.
Solvol Autosol or, as @Eseman suggests - toothpaste (which is gentler than Solvol) - should shift it and leave your bike unblemished.
Realize that I should've @'d @Jezston. -
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No it's not. Just don't go bonkers with it. Especially if you have metallic/flambouyant/flake/etc paint finishes. (Although there apparently is a T-Cut for metallic finishes - I've never used it, nor am I sure how it would work)
If your frame is powder coated, don't bother. It'll be wholly ineffective.