Cleaning contacts is the easy part. The real issue is why is your tank leaking juice in the first place?
A tiny drop of e-liquid on the contacts is normal and to be expected. However, if there is enough juice which is causing gurgling, juice in the mouth, or enough juice on the 510 connector that you have to clean it more than once a day, there's issues.
My guess is you are drawing too strongly on the clearomizer when you vape. The draw technique for vaping is different than for a tobacco cigarette. Use a longer, gentler, lighter draw technique.
Pulling too hard wicks too much juice to the coils. The coils can not vaporize all of the e-liquid, so the excess has no where to go but stay in the air chamber, resulting in the above symptoms.