Learn for all! Wait until its summer and super hot. Cats, like us, dont like being super hot. Then casually bring the cat into the bathroom with the door remaining open (so it can leave it it wants). Now start petting the cat. Cats like pets. After 5 pets, wet a rag with cool freshing temp water. Pet the cat gently with the wet rag once in a while once petting. The distraction of the pets, plus the cooling effect of the water create a positive response. Ive done this with two cats and both ended up loving the shower so much theyd jump in with you if you didnt shut the door. Classical conditioning is op.