Cleaning habanero oils off of tools
You have a few options, including what should have worked. Capsaicin will dissolve in high-proof alcohol, so if you have a bottle of 151 you might have a go with that. Vinegar can also be used to dissolve the oils. These are probably more effort and expenditure than they're worth though.


  You were on the right track; soap should have worked. In all likelihood, due to the concentration of the oils you simply did not wash it sufficiently. It requires quite a few passes (especially if the cutting board is porous) of hot, hot water and suds. As it is fat soluble you can try cleaning more thoroughly with most any soap with a de-greasing agent.


Moving forward, I have heard tell of spraying with non-stick spray to ward away the oils. I haven't felt some inordinate compulsion to do this and cannot attest to its efficacy, however with a slap chop and its nook and crannies you may find it a suitable use case.