Salt has antiseptic and anti-inflammatory properties. It removes dead skin cells from the face, deep cleanses the pores, and reduces oil production. Salt can also tighten pores and make skin tighter. Salt also improves blood circulation and increases the glow of the skin.

Vinegar is rich in acidity and helps balance the pH of the skin. It regulates the PH level of the skin and keeps it in a healthy state. Vinegar also has anti-inflammatory and calming properties that can relieve skin irritation and redness.

Using salt and vinegar together can capitalize on their respective benefits. Salt y cleanses pores and exfoliates and dirt, while vinegar balances the skin's PH level and soothes skin problems. Therefore, using salt and vinegar in the same step can achieve better results.

As for the choice of water temperature, I recommend using warm water. Cold water may cause vasoconstriction, making the skin not absorb the nutrients of salt and vinegar sufficiently. And hot water may irritate the skin, leading to dryness and sensitivity. Therefore, lukewarm water is a better option as it helps to deep cleanse the skin and maintain its moisture balance.

Washing your face with salt and vinegar can bring a lot of benefits, including removing dead skin cells, deep cleansing pores, reducing oil secretion, astringing pores, and improving blood circulation. Using salt and vinegar at the same time allows you to utilize their advantages, and warm water is the most suitable choice. If you want to try this method, remember to consult a medical professional or esthetician for advice first and choose the right products and methods for you.