Fruit Flies or Fungas gnats on houseplants, how do I get rid of them?

[Saiditagain]

Does anyone know how to get rid of fruit flies/fungas gnats (not sure which) that have taken up residence in the compost of my house plants?

I understand that failing to let the soil dry out between watering has probably caused the problem so how do I break the cycle. Does anyone know of either a chemical or natural way of dealing with them?

Thanks in advance.

Remove the very top layer of soil and throw it away,outside somewhere, (in compost?) Take the plant outside and use a water sprayer filled with a watered down fairy liquid solution to spray over the entire plant. That should sort out those pesky pests!