It will all depend on why it feels slippy. If it’s sweaty, greasy hands or body try an antiperspirant grip aid, AVOID waxy or sticky grip aids!!!!
If the pole is cold and your hands are cool and dry… warm the pole and your body. Try using this warm up https://www.studioveena.com/lessons/view/525b64a6-b328-401e-85e7-456c0ac37250 If you still slip even after a warm up, try a grip aid mix like this https://www.studioveena.com/videos/view/5e418c06-b198-4d3d-a806-7ffeac110005 with mighty grip powder over it.
If you need to warm or clean residue off the pole try steaming it. https://www.studioveena.com/videos/view/50ccac91-674c-4915-8e13-3b120ac37250