My guess it's mealie bugs. Check the link below.
Do isolate the plant from your other plants and check the other plants for infestion. This may have spread farther than you know. They hide under leaves and in nooks and crannies as well as in full view on top of leaves.
Take a look at the link and see if it looks like the bugs your seeing and then we can help with treatment.
I haven't battled these yet on AV's but have on my Hoya's before.,,,Debbie

Here is a link that might be useful: Mealie picture

I would think it was mildew and a quick solution would be to pour a solution of 1 part milk, 9 parts hot water. Pour over leaves.

If it is foliar mealies, swipe them off with a Q-tip dipped in alcohol. If they become reddish when squeezed, it's foliar mealies.

Nancy

Hi,
If they are fuzzy and a little sticky when they are touched you do have foliar mealies. Nancy has told you the correct treatment, just be sure you check the plant often and thoroughly and separate it from the other plants.
Fred in NJ