1. Ingredients: Check for natural ingredients and avoid harsh chemicals, parabens, and sulfates.

2. pH Balance: Look for soaps with a neutral pH to avoid skin irritation.

3. Skin Type: Choose a formula suitable for your skin type (dry, oily, sensitive).

4. Fragrance: Be mindful of added fragrances; opt for unscented or naturally scented options if you have sensitivities.

5. Moisturizing Properties: Look for moisturizing agents like glycerin, aloe vera, or essential oils to keep skin hydrated.

6. Certifications: Check for cruelty-free, organic, or eco-friendly certifications if these are important to you.

7. Brand Reputation: Research brands for customer reviews and reputation regarding quality and effectiveness.

8. Packaging: Consider eco-friendly packaging options to reduce plastic waste.

9. Price: Compare prices and consider value for money, keeping in mind that cheaper isn’t always better.

10. Allergies: If you have allergies, read all labels carefully to avoid any potential allergens.

11. Use Case: Identify the purpose, whether for handwashing, body wash, or household cleaning.

12. User Experience: Look for textures, lathering ability, and rinsing ease in reviews.

13. Availability: Check if it's available at local stores or online for convenience.

By considering these factors, you can find the best liquid soap for your needs!