Healthy Hair Mask, DIY at Home Beauty Treatment. Mix a tsp of apple cider vinegar & tsp of plain glycerin. Mix until smooth. Mix in well a beaten egg. Then add 2tbsp of caster oil. Thoroughly mix. Apply to entire length of hair. Place a plastic cap on & wrap head w/ a towel. Leave on hair for 2hrs. Wash as normal. The mask should be done 2 times a week for 1 month. After that, you can make masks for prevention & apply 1 time every 2 weeks.