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I use liquid dish soap and luke warm water.

You have to wash resin because when they cast resin, they use a release agent to allow the casted items to be removed from the molds more easy. When you recieve something from Forge World (as a common example) there will almost always be traces of the release agent. This agent will prevent primer and paint from adhering to the resin, and overall, ruin a perfectly good model.

As Pipboy101 said, use some dish soap in some warm (not hot) water and give the models a good scrubbing with an old toothbrush (be sure to brush the whole model, as you don't want any spots to still have the agent).

Well, FW use a particularly stubborn mold release that is no doubt distilled from baby-gak (just as hard to shift) - so that's why you scrub their stuff with steel wool.

Other resin producers take more care with their casts and have no such issues. Yet more others use talc as a release agent which just requires a gentle brushing with a fine, soft brush and then a wash in clean water.

I use an old electric toothbrush & a brass wire brush work great.
You can also try a glass fibre pen - but becareful of those fibres 'cause they itch like heck if they get on your skin.

I use washign up liquid, warm water ans a hard or medium toothbrush. Works fine.