Prepare for cleaning!!
After playing, your violin is dirty. Why? Because of the resin. What you have to do is just one thing: clean it! How? See the next steps.
Clean the chords
Clean under the chords
Also under the Fingerboard!!
Around the F holes
On the Chin Rest
Between the Fingerboard and the chords
On the Tailpiece and the Fine Tuners
Do all very soft and slow, and you are going to have a clean violin!!