Why are most cleaners acidic, basic, or neutral?So I did a pH lab, and we recorded pH in the numerical pH section, and we had vinegar, soapy water,...

Using one kind  or another of cleaner depends on what it is to be cleaned. The removing of dirt from a surface could be made by mechanical or chemical actions.

You have to know that there is an entire family of cleaners, all sorts for all kind of materials which have to be refreshed, this family including: acid cleaners, abrasive cleaners (mechanic action),detergents,solvents,alkali, bleaching substances.

For example, acid cleaners, if they are mild,they are recommended to remove stains of rust,deposits of hard water,copper and brass tarnish. Also acid cleaners, but in a concentrated formula, are recommended to remove rust from iron, cleaning sinks and tubs.

Mild acid cleanser: Citric Acid (Lemon Juice), Acetic Acid (Vinegar).

Strong acid cleanser: Oxalic Acid,dilute Hydrochloric Acid, dilute Sulfuric Acid.

From Alkali Family, we could mention Sodium bicarbonate which can clean glass,porcelain enamel, stainless steel  etc., by removing and suspending the grease, followed by a rinsing action after removing.

All you have to know that all cleaners have indications of use but also cautions, because the more concentrated they are, with both stronger they clean, but  they may have undesirable effects on health if are not respected the set safety standards.