Is There A Natural Way To Get Rid Of White Powdery Substance On Houseplant Leaves?

It sounds like white powdery mildew, which happens sometimes when the plant isn't getting much sunlight and/or the leaves have been watered and it is in sitting an area where the plant doesn't get much air circulation .
You can mix 2 tablespoons of dawn dishwashing liquid with 1 gallon of water.
Then pour into a spray bottle.
Take your plant outside and spray it really well with the solution. Gently wipe the plant with a cloth, making sure to get all the powdery mildew off.
Once you have done this, then use your garden hose to gently rinse the remainder of the mildew residue off the plant.
Let it sit outside in the SHADE until the leaves dry sufficiently, before you bring it back inside.
Remember to water your houseplant from the bottom to avoid mildew growth in the future.
Hope this helps.

I have outdoor plants,flowers. Their is a white substance on the dirt around the plant. The leaves have spots that are white. But don't come off when I rub them. The leaves are dying. When I watered this morning about 25 leaves just fell off. The other leaves just kinda hang on the plant. It is spreading to all my plants. I don't know how to stop it. Please help,is there a home remedy that works. Marty in Austin Texas. Please.