Spider mite can be almost impossible to eradicate from indoor plants as they move about on your clothes etc. If you have a bad spider mite infestation, you best bet would be spider mite predators - some useful info in this link Mr Google found, but there are several suppliers:
I used meths because I didn't have any white spirit and didn't want to waste my Tanquerays . I'm pretty sure any alcohol would have done . I wouldn't have used it on house plants, though. Fig leaves are tough and deciduous and the branches are woody so no real chance of permanent damage.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.