You may even lose the plant if you fail to get rid of them quickly and efficiently. These are extremely dangerous as they can spread like wildfire. Though they’re white as well, they have a fuzzy texture and live in small colonies all over the plant, making it look like small white bumps on the plant’s leaves. Mealybugs are plant bugs too, but are a little more different in appearance.
If the infestation is not widespread yet, you can simply dab the affected area with cotton swabs soaked in alcohol. Spray the affected area of the hoya with this mixture once in 3 days for 2 weeks. The Missouri Botanical Garden suggests mixing a tablespoon of insecticidal soap and 1 cup isopropyl alcohol with 1 quart (945 ml) of water to create a solution that can be applied on the leaves. They generally give the leaf a whitish layer and can spread across the entire plant if left unchecked. 
White scales are plant bugs that latch onto hoya leaves and spread all over the plant as they multiply. This will prevent the accumulation of mineral salts on the surface of the leaves. Instead of using hard water, use distilled or rainwater to water your hoya.
The underneath of the leaves contain pores and the stomata, so make sure the vinegar or lemon juice does not touch it as it may adversely affect the plant. Also, remember to only clean the upper portion of the leaf as that is where the deposits are found. Avoid rubbing it hard as it might damage the leaves. Using a clean, soft cloth, gently wipe the leaves with this solution. Take a few tablespoons of vinegar or lemon juice and dilute it with water. Though this isn’t really dangerous to the plant, it can affect its looks and appear like an infection. If you’re using hard water to water your hoya, there’s a high chance of these deposits accumulating more often. Hoya leaves might develop white spots on their surface over a period of time, which is actually just a buildup of mineral salts. Let’s dive in! Hoya Has White Spots Mineral Deposits In this article, we will focus on the causes of the various spots and what measures you can take to remove and prevent them from affecting your hoya plant again. Hoyas that have white, black, brown, red, and yellow spots or specks are usually caused by mineral deposits on leaves, white scale or mealybug infestations, shore flies, bacterial leaf spot disease, overwatering, under watering, sunburn, and nitrogen deficiency respectively. 
However, hoya plants can develop specks or spots on their leaves for various reasons. Hoyas are popular houseplants, and people love them for their attractive flowers, which vary across each species. There are around 200-300 species of this plant, most of which are native to Asian countries. A hoya is a tropical plant that grows all over the world in various climatic conditions.
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