Apply to hands and breathe deeply, diffuse for a bright, uplifting atmosphere, or to eliminate unwanted odors.
Lemon oil, and blends that contain it, will dissolve plastic or adhesive residue. Apply a drop, use a paper towel to wipe away the residue, then repeat. For the same reason, use care when storing homemade solutions that include lemon oil. D-limonene, the primary ingredient in citrus oils, has been correlated with increased kindness and honesty when diffused in sub-olfactory levels (see The Smell of Virtue, Liljenquist, BYU).