How do I get grease off a vinyl seat without leaving a mark on it?

Why the usual answer works

Grease does not dissolve in water, and alcohol does dissolve it. On a smooth, non-permeable surface an alcohol wipe is fast, leaves no film to rinse and disinfects at the same time, which is why it is the standard tool for a vinyl seat in a gym, a clinic or a car.

Usually recommended: Isopropyl alcohol.

Why it must not be used here

The coated-fabric trade body classifies vinyl, polyurethane and silicone coated fabrics as SOFT-SURFACE materials despite their being smooth and non-permeable, and states that hard-surface cleaners, sanitizers and disinfectants are not intended for soft surfaces and could damage them. It then names hand sanitisers among the substances that STAIN coated fabric. So the alcohol wipe that removes the grease is on the list of things that mark the seat, and the mark it leaves is not a soil sitting on the coating that can be wiped off again.

This damage cannot be undone by cleaning. There is nothing left on the surface to remove.

More about coated upholstery and grease.

What to do instead

Take the soil off first with a soft-surface product rather than a hard-surface one, and treat cleaning and disinfecting as two operations rather than one. The trade body is explicit that they are not the same: a soil-removal product may not disinfect and a disinfectant may not remove soil, and the surface should be clean of soil BEFORE anything is sanitised or disinfected. Then rinse, which is the step this source says almost nobody performs — it observes that technicians typically do not rinse coated fabric, so product residue is the normal state of the surface rather than the exception. A residue film is what makes a cleaned vinyl seat feel tacky and pick up the next mark faster. None of this applies to ordinary fabric upholstery, which is a different material with different guidance.

• Detergent — A surfactant-based cleaner. The general-purpose answer for greasy and particulate soil, and the correct first choice far more often than any specialist product.
• Rinsing and drying — The step people skip, and the one that decides whether cleaning protected the surface or damaged it. Residue left behind is exposure that continues after you stop.
• Blotting — Lifting a spill straight up into an absorbent cloth rather than working at it. The opposite of what almost everyone does, and the trade bodies are explicit about why.

The chemistry behind both halves

• Cleaning, sanitising and disinfecting — Three operations, one word. Neither implies the other — and the order is not a preference: soil shields organisms from the agent meant to kill them.
• Rinsing and residue after disinfecting — There is no universal rinse rule, and inventing one would be wrong. What is fixed is the order: rinsing before the contact time has elapsed cancels the job.
• Porous and non-porous surfaces — On a hard surface, contamination sits on top. In a porous one it goes in — and the regulator's own answer for porous material is sometimes to throw it away.
• Material compatibility — The reason CleaningHQ answers questions about surfaces rather than about products. The same agent is the right answer and the wrong answer depending on what it lands on.