Type the two prices you found for the same product.
Pick one unit for both prices. Washes: only the number printed on each pack.
Changing the product or the unit unticks this.
Multipack? Multiply: 6 × 1.5 L = 9000 ml.
Empty: only the price per unit is compared.
Both are needed. Leave blank if unknown.
Your own usage, if you know it.