I was previously advised to use a homemade mixture of dishwashing liquid,...
Before a control can be recommended you have to identify the plant, the pest, and how much damage is occurring. Once you have identified the above, a control can be recommended. It is also possible that the pest may not be causing any damage.
We do not recommend homemade mixtures as phytoxicity, plant damage, can occur. You can send a digital photo of the plant and pest in question or contact your extension for more information http://bernalilloextension.nmsu.edu/