Mayonnaise Tricks from a great article from: diynetwork.com by Mick Telkamp
The magic that is mayonnaise does not end with lunch. This perfect blend of oil, acid and protein can be used in unexpected ways well beyond tuna salad. Consider some of these great uses for homemade (or even store-bought) mayo outside the kitchen.
1. Sunburn relief: Cold mayonnaise will soothe a sunburn, provide much-needed moisture and the vinegar even serves as a natural anesthetic.
2. Remove tar: Apply a bit of mayo to road tar, let it rest a few minutes, then wipe it clean.
3. Condition hair: Mayonnaise is a nearly perfect combination of moisturizing oil and nutrient-building egg proteins to help revitalize dry hair. After washing hair, apply a thin treatment of mayonnaise and let rest one hour before rinsing to bring body and shine back to damaged hair.
4. Shine houseplants: An old trick. Rub a little mayo onto plant leaves with a paper towel and wipe clean to add a healthy shine to houseplants.
5. Strengthen fingernails: Immerse fingers in mayonnaise for 5 minutes or so to strengthen nails and restore cuticle health.
6. Kill lice: A thick coating of mayonnaise applied to the hair and left overnight will kill lice without the need for expensive chemical treatments. Nits are not affected, and multiple applications would be necessary to fully eradicate those pesky critters.
7. Lubricate hinges: All out of WD? Smear a little mayo on a door hinge to stop that squeak.
8. Restore wood furniture: Water stains will wipe away with a brief application. If cracks have formed on wood surfaces, fill the cracks with mayonnaise, and leave it for a few days before wiping clean. The combination of oil and protein will cause the wood to swell, closing up those unsightly scratches and gaps.