Vinegar, bleach and boiling water
Contact with a visible group cannot establish what remains concealed; household chemicals also have their own label and material risks.
Visible contact is not a diagnosis
DIY termite remedies: what they do not answer
Killing termites that are visible is not the same as identifying the extent of activity or managing its source.
Orange oil and borax
A substance name does not answer where it can legally or safely be used, whether the use follows its label, or whether it meets the management objective.
Supermarket sprays
Spraying may disturb activity and evidence before assessment.
A better first step
Photograph the location, stop opening the area and arrange an assessment.