The little white spots are spider mites most likely, Well as spraying them with soapy water can work it also can kill the plant, There is s good ways to get rid of spider mites.
spider mites feed on sap from your plants usually under the leaves if you leave sweeter sap like nectar or honey near the plant somewhere it should distract the spider mites for at least a little while. Also growing your plants near other plants that produce strong smelling nectar. Venus Fly traps work really well as they are ment to control insects

You can always tell by spraying regular water on your plants and you can see their tiny tiny webs