Spark ignition gasoline and compression ignition diesel engines differ in how they supply and ignite the fuel. In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion.
1 If your skin is too sensitive, dilute tea tree oil with some baby shampoo. Add 10-20 drops of tea tree oil to 1/2 cup of baby shampoo. Use this daily to wash your scalp and hair till you get rid of itchy scalp.  You can even massage diluted tea tree oil to your scalp.
When using apple cider vinegar, choose organic, raw varieties. These are minimally processed and retain the highest levels of nutrients. For scalp psoriasis. Apple cider vinegar is promoted as a natural anti-itch agent. NPF agrees that the liquid may help with scalp itch. If youâd like to try using apple cider vinegar to treat scalp psoriasis, apply to your scalp several times a week. If it causes a burning sensation, try diluting the vinegar on a 1:1 ratio with water. If burning still occurs, do not use. Bath. Some people bathe in diluted apple cider vinegar. To do this, add 1 cup to a warm bath.