HYDRATION
Most hoya plants enjoy a soil that is lightly moist — but not soggy —at all times.
SOIL
Many hoyas are epiphytic and require a special potting mix that contains high amounts of chunky material, such as tree bark or pumice stone.
LEAF CARE
Because of the waxy texture of most hoya leaves, you might notice hard water spots on the leaves of your plants. To polish your hoya leaves, dip a microfiber cloth in a solution of 1:10 lemon juice and water and gently wipe.
A Final NOTE
I highly recommend doing research on the specific species of hoya that you own.