I love the passion you show for your Passion Flower vines and I have tried but failed to grow this heat-loving vine in my garden so I applaud how long you have kept your plants alive. My best guess for what is bugging you is that aphid have moved in on one of your plants. The clear dots you see could be the \"honey dew\" or aphid droppings and the aphid themselves can be hiding under the leaves. A soapy water rinse will help a lot but if there are too many leaves to clean you may need to cut the plant back to just a foot or so tall and clean each leaf. Don't do this pruning until just before you set the plants back outside as pruning will stimulate growth and you don't want the vines to wake up from their winter dormancy. I assume your plants are overwintered in a green house or sun room and this makes a perfect place for aphid to multiply. Once the vines get back outdoors where lady bugs and other predators can help eat the aphid I think your Passion Vines will be fine. Let us know how it turns out and Keep Growing, Marianne Binetti