Your indoor plants are mostly tropical plants. They will enjoy being outside during a rain shower which resembles rain in the Tropics.
And a good old soak will get rid of most of the dust; take care during sunny spells as plants scorch easily.
Look at the healthy state of this mix bowl. It contains a Sword Fern, a Dracaena marginata tricolor and two varieties of Peperomia (one is hidden around the back of it), growing happily together for some time now.
The one thing these three varieties have in common is that they could either cope well or prefer quite dry conditions, in a hot spot inside on a south facing window in U.K.