Sticky chromatic slide

I have a Hohner 280/64 and have noticed lately that whenever I first pull it 
out of the case, the slide tends to stick a bit.  It loosens up fast, and 
stays limber while I play it, until the next time I whoop it out.  What is 
recommended to lube it with?  I thought of Vaseline but was afraid it might 
gunk up over time. Thanks

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