Washing up liquid generally has a pH level of between 7 and 8. The pH scale runs from 1 to 14, with the upper half (8-14) considered alkaline and the lower half (1-6) considered acidic. Alkalines are good for cleaning grease, oils and other dirt, while acidic products are best for getting rid of rust, calcium and other mineral build-ups.
Being right in the middle of the pH scale, washing up liquid is considered neutral when it comes to the pH level. This is what makes it great for a wide range of household and everyday cleaning tasks.